298 lines
16 KiB
JSON
298 lines
16 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-2026-72116",
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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": "2026-08-09T03:40:39.906Z",
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"datePublished": "2026-08-15T05:52:56.260Z",
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"dateUpdated": "2026-10-16T18:44:56.837Z"
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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": "2026-08-19T16:36:05.976Z"
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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\ncan: bcm: fix stale rx/tx ops after device removal\n\nRX: an RX_SETUP update(!) for an existing op skipped can_rx_register()\nunconditionally, even when a concurrent NETDEV_UNREGISTER had already\ntorn down its registration (op->rx_reg_dev == NULL). This silently\ndid not re-enable frame delivery for that updated filter. bcm_rx_setup()\nnow re-registers in that case, while leaving rx_ops with ifindex = 0\n(all CAN devices) which never carry a tracked rx_reg_dev registered as-is.\n\nTX: bcm_notify() only handled bo->rx_ops on NETDEV_UNREGISTER, leaving\ntx_ops with an active cyclic transmission re-arming its hrtimer\nindefinitely to execute bcm_tx_timeout_handler(). Cancelling the hrtimer\nprevents the runaway timer and any injection into a later reused ifindex,\nsince nothing else calls bcm_can_tx() for the op until an explicit\nTX_SETUP update re-arms it.\n\nUnlike bcm_rx_unreg(), which clears the tracked rx_reg_dev for rx_ops,\nthe ifindex is intentionally left unchanged for tx_ops. bcm_tx_setup()\nalways rejects ifindex 0, so clearing it would strand the op: neither a\nlater TX_SETUP (bcm_find_op()) nor TX_DELETE (bcm_delete_tx_op()) could\never find it again, since both require an exact ifindex match."
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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:N/I:H/A:H",
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"baseScore": 7.1,
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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 bug is reached only via local PF_CAN/CAN_BCM syscalls (socket/connect/sendmsg TX_SETUP or RX_SETUP); bcm_tx_timeout_handler() is driven by a local hrtimer, not by remote network services or CAN bus frames alone.\nAC:L - An attacker controls both sides by arming cyclic TX with SETTIMER/STARTTIMER, then triggering or waiting for NETDEV_UNREGISTER (e.g., concurrent ip link del in a user namespace) while ifindex reuse is normal kernel behavior, making injection reliably achievable.\nPR:L - can_create(), bcm_connect(), and bcm_sendmsg() perform no capability checks; any local user with CAN access (or CAP_NET_ADMIN in an unprivileged user namespace to create vcan) can open BCM sockets and program cyclic TX/RX ops.\nUI:N - Exploitation requires only the attacker opening a BCM socket and sending TX_SETUP/RX_SETUP messages; no victim action such as mounting media or opening files is needed once local CAN access exists.\nS:U - Impact is unauthorized CAN transmission/monitoring disruption within the same kernel host; it does not cross VM, container, or IOMMU security boundaries even when frames reach an adjacent vehicle or factory CAN segment.\nC:N - The flaw causes stale timer-driven transmission and missed RX re-registration, not kernel memory disclosure; no out-of-bounds read, UAF, or other information-leak primitive is present in this bug.\nI:H - After NETDEV_UNREGISTER, orphaned tx_ops keep bcm_can_tx() running with a stale ifindex, so attacker-crafted cyclic CAN frames can be injected onto any later netdev that reuses that ifindex, including safety-critical automotive or industrial buses.\nA:H - Uncancelled hrtimers on stale tx_ops re-arm bcm_tx_timeout_handler() indefinitely after device removal, causing persistent timer/softirq CPU consumption, and the RX_SETUP path can silently stop frame delivery after unregister races."
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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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"net/can/bcm.c"
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],
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"versions": [
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{
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"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
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"lessThan": "d30a36066ed3abefb72ae18901f71841ba18b350",
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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": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
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"lessThan": "ca829677ffa2de5d79e06366e19ac1e4f5cc78dd",
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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": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
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"lessThan": "9517d8fb0b191398d35b9b7f8c719c1cc7761cb1",
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"status": "affected",
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},
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{
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"version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
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"lessThan": "60d8a7942f4ed2d975207aaeba1adb576707e53d",
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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": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
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"lessThan": "f749e4564952d60e96930c09f2be99955d07c22e",
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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": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
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"lessThan": "6be3e1fedf03eab36a2c09d755d1171287b2014b",
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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": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
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"lessThan": "b31d0933509c5a35c0be5736a2ce8df0d1bf112c",
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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": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
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"lessThan": "3b762c0d950383ab7a002686c9136b9aa55d2d70",
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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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"net/can/bcm.c"
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],
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"versions": [
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{
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"version": "2.6.25",
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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": "2.6.25",
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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": "5.10.265",
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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": "5.15.216",
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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": "6.1.183",
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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": "6.6.148",
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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": "6.12.101",
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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": "6.18.42",
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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": "7.1.5",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/d30a36066ed3abefb72ae18901f71841ba18b350"
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},
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{
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"url": "https://git.kernel.org/stable/c/ca829677ffa2de5d79e06366e19ac1e4f5cc78dd"
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},
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{
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"url": "https://git.kernel.org/stable/c/9517d8fb0b191398d35b9b7f8c719c1cc7761cb1"
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},
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{
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"url": "https://git.kernel.org/stable/c/60d8a7942f4ed2d975207aaeba1adb576707e53d"
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},
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{
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"url": "https://git.kernel.org/stable/c/f749e4564952d60e96930c09f2be99955d07c22e"
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},
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{
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"url": "https://git.kernel.org/stable/c/6be3e1fedf03eab36a2c09d755d1171287b2014b"
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},
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{
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"url": "https://git.kernel.org/stable/c/b31d0933509c5a35c0be5736a2ce8df0d1bf112c"
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},
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{
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"url": "https://git.kernel.org/stable/c/3b762c0d950383ab7a002686c9136b9aa55d2d70"
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}
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],
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"title": "can: bcm: fix stale rx/tx ops after 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-2026-72116",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T18:41:52.725992Z"
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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": "2026-10-16T18:44:56.837Z"
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}
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}
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]
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}
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} |