222 lines
13 KiB
JSON
222 lines
13 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-2025-40094",
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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": "2025-04-16T07:20:57.163Z",
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"datePublished": "2025-10-30T09:48:02.446Z",
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"dateUpdated": "2026-08-05T12:07:45.475Z"
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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": "2026-08-05T12:07:45.475Z"
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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\nusb: gadget: f_acm: Refactor bind path to use __free()\n\nAfter an bind/unbind cycle, the acm->notify_req is left stale. If a\nsubsequent bind fails, the unified error label attempts to free this\nstale request, leading to a NULL pointer dereference when accessing\nep->ops->free_request.\n\nRefactor the error handling in the bind path to use the __free()\nautomatic cleanup mechanism.\n\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000020\nCall trace:\n usb_ep_free_request+0x2c/0xec\n gs_free_req+0x30/0x44\n acm_bind+0x1b8/0x1f4\n usb_add_function+0xcc/0x1f0\n configfs_composite_bind+0x468/0x588\n gadget_bind_driver+0x104/0x270\n really_probe+0x190/0x374\n __driver_probe_device+0xa0/0x12c\n driver_probe_device+0x3c/0x218\n __device_attach_driver+0x14c/0x188\n bus_for_each_drv+0x10c/0x168\n __device_attach+0xfc/0x198\n device_initial_probe+0x14/0x24\n bus_probe_device+0x94/0x11c\n device_add+0x268/0x48c\n usb_add_gadget+0x198/0x28c\n dwc3_gadget_init+0x700/0x858\n __dwc3_set_mode+0x3cc/0x664\n process_scheduled_works+0x1d8/0x488\n worker_thread+0x244/0x334\n kthread+0x114/0x1bc\n ret_from_fork+0x10/0x20"
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - The bind/unbind/re-bind sequence that creates and then dereferences the stale `acm->notify_req` is driven entirely by local writes to `/sys/kernel/config/usb_gadget/<g>/UDC` (or legacy gadget module load); no USB traffic from an attached host is needed, so the bug is reachable through local filesystem/syscall access rather than requiring physical port access.\nAC:L - The attacker deterministically controls every step — the successful first bind, the unbind that leaves `acm->notify_req` dangling, and the forced failure of the next bind by exhausting `usb_interface_id()`/`usb_ep_autoconfig()` through functions added to the config between cycles — plus the heap spray that reclaims the freed `usb_request`. No race or uncontrolled condition is involved.\nPR:L - Only write access to the USB gadget configfs tree is required; `acm_bind()` performs no capability check, and on Android and embedded/industrial deployments USB function switching is routinely delegated to non-root system/daemon accounts that own that tree.\nUI:N - The attacker performs all configfs writes itself; no cable plug event, victim action, or interaction with another user is required to reach the stale free.\nS:U - The dangling-pointer free corrupts kernel heap state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `gs_free_req()` reads `req->buf` out of the reclaimed `struct dwc3_request` slab and `ep->ops` out of a freed `struct dwc3_ep`, so an attacker who grooms those caches gains object-overlap and arbitrary-free primitives that are readily converted into kernel memory disclosure.\nI:H - `kfree()` of an attacker-controlled pointer read from the freed request, a double free through `dwc3_gadget_ep_free_request()`, and an indirect call through a reclaimable `ep->ops` table together yield classic heap-corruption primitives leading to arbitrary write and privilege escalation.\nA:H - The observed effect is a kernel oops — NULL/garbage `ep->ops` dereference in `usb_ep_free_request()` — and the double free independently causes slab corruption and panic, which the attacker can trigger repeatedly."
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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/usb/gadget/function/f_acm.c"
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],
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"versions": [
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{
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"version": "1f1ba11b64947051fc32aa15fcccef6463b433f7",
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"lessThan": "c5d116862dd3ed162d079738a5ebddf9fceea850",
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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": "1f1ba11b64947051fc32aa15fcccef6463b433f7",
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"lessThan": "2b1546f7c5fc6c44555a8e7a2b34229d1dcd2175",
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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": "1f1ba11b64947051fc32aa15fcccef6463b433f7",
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"lessThan": "e348d18fb0124b662cfefb3001733b49da428215",
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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": "1f1ba11b64947051fc32aa15fcccef6463b433f7",
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"lessThan": "201a66d8e6630762e760e1d78f1d149da1691e7b",
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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": "1f1ba11b64947051fc32aa15fcccef6463b433f7",
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"lessThan": "c4301e4dd6b32faccb744f1c2320e64235b68d3b",
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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": "1f1ba11b64947051fc32aa15fcccef6463b433f7",
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"lessThan": "47b2116e54b4a854600341487e8b55249e926324",
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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/usb/gadget/function/f_acm.c"
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],
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"versions": [
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{
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"version": "2.6.27",
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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": "2.6.27",
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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": "5.15.196",
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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": "6.1.158",
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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": "6.6.114",
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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": "6.12.55",
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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": "6.17.5",
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"lessThanOrEqual": "6.17.*",
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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",
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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": "2.6.27",
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"versionEndExcluding": "5.15.196"
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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": "2.6.27",
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"versionEndExcluding": "6.1.158"
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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": "2.6.27",
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"versionEndExcluding": "6.6.114"
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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": "2.6.27",
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"versionEndExcluding": "6.12.55"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.27",
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"versionEndExcluding": "6.17.5"
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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": "2.6.27",
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"versionEndExcluding": "6.18"
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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/c5d116862dd3ed162d079738a5ebddf9fceea850"
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},
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{
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"url": "https://git.kernel.org/stable/c/2b1546f7c5fc6c44555a8e7a2b34229d1dcd2175"
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},
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{
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"url": "https://git.kernel.org/stable/c/e348d18fb0124b662cfefb3001733b49da428215"
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},
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{
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"url": "https://git.kernel.org/stable/c/201a66d8e6630762e760e1d78f1d149da1691e7b"
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},
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{
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"url": "https://git.kernel.org/stable/c/c4301e4dd6b32faccb744f1c2320e64235b68d3b"
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},
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{
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"url": "https://git.kernel.org/stable/c/47b2116e54b4a854600341487e8b55249e926324"
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}
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],
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"title": "usb: gadget: f_acm: Refactor bind path to use __free()",
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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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}
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} |