360 lines
18 KiB
JSON
360 lines
18 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-2026-72120",
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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": "2026-08-09T03:40:39.907Z",
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"datePublished": "2026-08-15T05:52:59.226Z",
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"dateUpdated": "2026-10-16T18:44:57.136Z"
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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": "2026-08-17T05:40:33.370Z"
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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: add missing rcu list annotations and operations\n\nsashiko-bot remarked the missing use of list_add_rcu() in\nbcm_[rx|tx]_setup() to have a proper initialized bcm_op structure\nwhen bcm_proc_show() traverses the bcm_op's under rcu_read_lock().\n\nTo cover all initial settings of the bcm_op's the list_add_rcu() calls\nare moved to the end of the setup code.\n\nWhile at it, also fix the mirroring removal side: bcm_release() called\nbcm_remove_op() - which frees the op via call_rcu() - on ops that were\nstill linked in bo->tx_ops/bo->rx_ops, without list_del_rcu() first.\nUnlink each op with list_del_rcu() before handing it to bcm_remove_op(),\nmatching the existing pattern in bcm_delete_tx_op()/bcm_delete_rx_op()."
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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 - Exploitation requires local syscalls (socket/connect/sendmsg/close on PF_CAN/CAN_BCM) and/or reading /proc/net/can-bcm/<inode>; the bug is in RCU list management and procfs traversal, not in remote CAN frame reception.\nAC:L - The attacker controls both sides of the race—concurrent TX_SETUP/RX_SETUP or socket close while repeatedly reading the world-readable proc entry—so the UAF in bcm_proc_show is reliably triggerable without external timing luck.\nPR:L - PF_CAN CAN_BCM sockets are created and connected without capability checks; RX_SETUP works with ifindex 0 (no bound CAN device), so any unprivileged local user can create ops and race procfs reads on automotive, industrial, and embedded systems with CONFIG_CAN_BCM.\nUI:N - No victim interaction is required; the attacker drives the full exploit sequence (socket setup, opcode installation, proc reads, and socket teardown) from their own local process threads.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain; impact is local privilege escalation or crash, not crossing a VM, container, or IOMMU security boundary.\nC:H - bcm_proc_show dereferences bcm_op fields (can_id, flags, timers, counters) from list entries that may already be freed via call_rcu in bcm_remove_op, enabling kernel heap memory disclosure and further exploitation primitives.\nI:H - Freed bcm_op structures are kmalloc heap objects containing list_head links, sock pointers, and hrtimer state; UAF combined with heap spraying can yield arbitrary kernel writes and control-flow hijack for privilege escalation.\nA:H - Concurrent procfs traversal of tx_ops/rx_ops lists containing stale pointers to RCU-freed bcm_op objects can cause kernel oops/panic during list walking or field access, and UAF exploitation attempts can also crash the system."
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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": "659701c0b954ccdb4a916a4ad59bbc16e726d42c",
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"lessThan": "8357255e56dc1aaa437e3c53ee9385de984e0d57",
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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": "0622846db728a5332b917c797c733e202c4620ae",
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"lessThan": "8e1c7257c81577130f5ce90f69b2a2c3ce63f957",
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"status": "affected",
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},
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"status": "affected",
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},
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{
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"lessThan": "f53bdab85e64eb57d6899a30d1307fd5a3639cc7",
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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": "63567ecd99a24495208dc860d50fb17440043006",
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"lessThan": "4e22e8b505f877573bbdfdbcb680babad9b2f7a1",
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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": "dac5e6249159ac255dad9781793dbe5908ac9ddb",
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"lessThan": "b06a4a397ac826603f39875cb7c7819a41365196",
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"status": "affected",
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{
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"status": "affected",
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"status": "affected",
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},
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{
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"version": "19f553a1ddf260da6570ed8f8d91a8c87f49b63a",
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"status": "affected",
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},
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{
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"version": "7c9db92d5f0eadca30884af75c53d601edc512ee",
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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": "5.10.238",
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"lessThan": "5.10.261",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.15.185",
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"lessThan": "5.15.212",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.141",
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"lessThan": "6.1.178",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.93",
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"lessThan": "6.6.145",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.12.31",
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"lessThan": "6.12.97",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.4.294",
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"lessThan": "5.5",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.14.9",
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"lessThan": "6.15",
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"status": "affected",
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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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"net/can/bcm.c"
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],
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"version": "0",
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"status": "unaffected",
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{
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"version": "5.10.261",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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{
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"version": "5.15.212",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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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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"operator": "OR",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8357255e56dc1aaa437e3c53ee9385de984e0d57"
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},
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{
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"url": "https://git.kernel.org/stable/c/8e1c7257c81577130f5ce90f69b2a2c3ce63f957"
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},
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{
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"url": "https://git.kernel.org/stable/c/eb1c26eab4d1f0b4450439b4b88c3e73faf1da98"
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},
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{
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"url": "https://git.kernel.org/stable/c/f53bdab85e64eb57d6899a30d1307fd5a3639cc7"
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},
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{
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"url": "https://git.kernel.org/stable/c/4e22e8b505f877573bbdfdbcb680babad9b2f7a1"
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},
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{
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"url": "https://git.kernel.org/stable/c/b06a4a397ac826603f39875cb7c7819a41365196"
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},
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{
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"url": "https://git.kernel.org/stable/c/30f7bb922cb7e7f072a56c7cb7a5efccd2ceca1d"
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},
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{
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"url": "https://git.kernel.org/stable/c/7b2c3eabc4dafc062a25e10711154f2107526a78"
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}
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],
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"title": "can: bcm: add missing rcu list annotations and operations",
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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-2026-72120",
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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": "2026-10-16T18:41:58.342764Z"
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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": "2026-10-16T18:44:57.136Z"
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}
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}
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]
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}
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} |