322 lines
19 KiB
JSON
322 lines
19 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64586",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T15:36:31.798Z",
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"datePublished": "2026-08-06T07:06:27.158Z",
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"dateUpdated": "2026-10-19T20:48:43.327Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-23T12:45:44.685Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: drain bus_reset work on device removal\n\nbrcmf_fw_crashed() and the debugfs \"reset\" entry both schedule\ndrvr->bus_reset, whose callback recovers drvr through container_of()\nand dereferences it. The removal path frees drvr (brcmf_free ->\nwiphy_free) without draining the work, so a bus_reset callback pending\nor running during removal can outlive drvr.\n\nCancellation cannot live in brcmf_detach() or brcmf_free(): the work\ncallback reaches teardown through the bus .reset op (PCIe\nbrcmf_pcie_reset -> brcmf_detach; SDIO brcmf_sdio_bus_reset ->\nbrcmf_sdiod_remove -> brcmf_free), so cancelling there would wait for\nthe running work and deadlock.\n\nAdd a per-bus mutex (bus_reset_lock) and route all arming through\nbrcmf_bus_schedule_reset(), which under the lock skips when the bus is\nmarked removing. Each bus remove entry calls\nbrcmf_bus_cancel_reset_work(), which under the same lock sets removing\nand cancels the work. Holding the mutex across cancel_work_sync() makes\nthe set-removing + drain step atomic. Every producer reaches the arming\npath from process context -- the PCIe firmware-halt notification runs in\nthe threaded IRQ handler (brcmf_pcie_isr_thread) and the SDIO hostmail\npath runs from the data workqueue -- so the mutex is taken only in\nsleepable contexts. Where applicable the remove entry first stops the\nfirmware-crash producer: on PCIe mask the mailbox and synchronize_irq;\non SDIO unregister the bus interrupt and cancel the data worker, which\nalso reports firmware halts through brcmf_fw_crashed(). The mutex is\ninitialized at bus allocation. The SDIO suspend power-off path frees\ndrvr through the same brcmf_sdiod_remove() and takes the same lock;\nresume re-allows the work only on a successful re-probe.\n\nAlso guard brcmf_fw_crashed() against a NULL bus_if/drvr: it can fire\nbefore brcmf_attach() wires up drvr, and it dereferences drvr\n(bphy_err/brcmf_dev_coredump) before reaching the arming gate.\n\nThe bus_reset work is shared across buses, so the drain is applied to\nevery remove path: PCIe (the .reset op introduced by the Fixes commit),\nSDIO (arms the same work through brcmf_fw_crashed()), and USB (via the\ndebugfs \"reset\" entry). cancel_work_sync() drains a running or pending\nbus_reset work item before removal frees drvr, and patch 1/2 makes the\nscratch-buffer release safe when reset teardown has already released\nthose DMA buffers.\n\nThis patch fixes the lifetime of the bus_reset work item itself. It does\nnot attempt to address the separate, pre-existing lifetime of the\nasynchronous firmware completion started by the PCIe reset path. That\ncallback needs its own lifetime/ownership protocol and is being tracked\nseparately.\n\nThis issue was found by an in-house static analysis tool."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:A - bus_reset is armed by brcmf_fw_crashed() when Broadcom fullmac signals FWHALT (PCIe mailbox ISR thread / SDIO hostmail). An adjacent 802.11 attacker can induce that halt with malformed frames; the pending work then races device removal (USB hot-unplug, SDIO suspend power-off) that frees drvr without draining the work.\nAC:L - The attacker repeatedly induces firmware halts to schedule bus_reset and can align removal (USB unplug on shared dongles/kiosks, or SDIO suspend) so the work runs after wiphy_free; both sides are attacker-influenced and freely retryable, so success does not depend on uncontrollable timing.\nPR:N - FWHALT delivery and brcmf_fw_crashed() need no host credentials; concurrent free via USB disconnect or automatic SDIO power-cut suspend likewise requires no account or capability. The debugfs reset path is root-only but is not the highest-severity reachability.\nUI:N - Firmware-halt recovery and device removal/suspend paths run in kernel workqueues and bus callbacks without the victim opening a file, mounting media, or otherwise interacting.\nS:U - The UAF corrupts host-kernel heap (struct brcmf_pub embedded in the wiphy) within the same kernel security authority; it is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - Use-after-free of drvr via container_of on the freed bus_reset work_struct lets an attacker reallocate the wiphy/drvr slab and observe attacker-controlled object contents through subsequent driver dereferences, yielding an arbitrary kernel read primitive.\nI:H - The recycled work_struct/drvr is dispatched by the workqueue (func pointer / bus_if ops), enabling heap corruption and control-flow hijack when brcmf_core_bus_reset runs on attacker-shaped memory after brcmf_free/wiphy_free.\nA:H - Even without full exploitation, running bus_reset after wiphy_free dereferences freed drvr/bus_if state and reliably causes kernel oops/panic or driver teardown failure, denying availability of the host."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c"
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],
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"versions": [
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{
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"version": "4684997d9eea29380000e062755aa6d368d789a3",
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"lessThan": "9dfb09cb0abbf92a06f93e0715e163aa188a84da",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4684997d9eea29380000e062755aa6d368d789a3",
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"lessThan": "4824e3bcc68f8d678b409039d1bb48c7b5ea73dc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4684997d9eea29380000e062755aa6d368d789a3",
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"lessThan": "61127dd20920bf28460a1609aabb0dafa2f54fac",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4684997d9eea29380000e062755aa6d368d789a3",
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"lessThan": "c268331845ee00dbdbccb000826bb612dff2bee7",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4684997d9eea29380000e062755aa6d368d789a3",
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"lessThan": "e3815d1ffbb9be4f1605ddc3b427557893461683",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4684997d9eea29380000e062755aa6d368d789a3",
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"lessThan": "02d378828af8bb74f6c2f4d2bee3c77cf16c861e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4684997d9eea29380000e062755aa6d368d789a3",
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"lessThan": "177a25be1195f8bdc6160ba5f1a5699f7041c985",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4684997d9eea29380000e062755aa6d368d789a3",
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"lessThan": "43b25879f004c98defa2776bedc6ca4763c51945",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h",
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"drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c"
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],
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"versions": [
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{
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"version": "5.2",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.266",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.217",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.184",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.151",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.103",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.44",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "5.10.266"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "5.15.217"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "6.1.184"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "6.6.151"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "6.12.103"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "6.18.44"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "7.1.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.2",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/9dfb09cb0abbf92a06f93e0715e163aa188a84da"
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},
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{
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"url": "https://git.kernel.org/stable/c/4824e3bcc68f8d678b409039d1bb48c7b5ea73dc"
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},
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{
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"url": "https://git.kernel.org/stable/c/61127dd20920bf28460a1609aabb0dafa2f54fac"
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},
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{
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"url": "https://git.kernel.org/stable/c/c268331845ee00dbdbccb000826bb612dff2bee7"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3815d1ffbb9be4f1605ddc3b427557893461683"
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},
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{
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"url": "https://git.kernel.org/stable/c/02d378828af8bb74f6c2f4d2bee3c77cf16c861e"
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},
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{
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"url": "https://git.kernel.org/stable/c/177a25be1195f8bdc6160ba5f1a5699f7041c985"
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},
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{
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"url": "https://git.kernel.org/stable/c/43b25879f004c98defa2776bedc6ca4763c51945"
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}
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],
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"title": "wifi: brcmfmac: drain bus_reset work on device removal",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-64586",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:43:21.576355Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T20:48:43.327Z"
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}
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}
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]
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}
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} |