358 lines
19 KiB
JSON
358 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-2026-72123",
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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": "2026-08-15T05:53:01.433Z",
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"dateUpdated": "2026-10-16T18:44:57.598Z"
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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": "2026-08-19T16:36:18.988Z"
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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: defer rx_op deallocation to workqueue to fix thrtimer UAF\n\nCommit f1b4e32aca08 (\"can: bcm: use call_rcu() instead of costly\nsynchronize_rcu()\") replaced synchronize_rcu() in bcm_delete_rx_op()\nwith call_rcu() and introduced the RX_NO_AUTOTIMER flag.\n\nHowever, this flag check was omitted for thrtimer in the packet rx\nfast-path. During BCM RX operation teardown, a concurrent RCU reader\n(bcm_rx_handler) can race and re-arm thrtimer via\nbcm_rx_update_and_send() after call_rcu() has been scheduled. Once\nthe RCU grace period elapses, bcm_op is freed. The subsequently\nfiring thrtimer then dereferences the deallocated op, causing a UAF.\n\nAdding flag checks to the rx fast-path (bcm_rx_update_and_send) does not\nfully close the TOCTOU race and introduces latency for every CAN frame.\nConversely, calling hrtimer_cancel() directly inside the RCU callback\n(softirq context) is fatal as hrtimer_cancel() can sleep, triggering\na \"scheduling while atomic\" panic.\n\nResolve this by deferring the timer cancellation and memory free to a\ndedicated unbound workqueue (bcm_wq). The RCU callback now queues a\nwork item to bcm_wq, which safely cancels both timers and deallocates\nmemory in sleepable process context. A dedicated workqueue is used to\nprevent system-wide WQ saturation and is cleanly flushed/destroyed\non module unload to avoid rmmod page faults.\n\nSince the deferred work can now outlive the calling context by an\nunbounded amount, also take a reference on op->sk when it is assigned\nand drop it only once the deferred work has cancelled both timers, so a\nsocket can no longer be freed out from under a still-armed timer whose\ncallback (bcm_send_to_user()) dereferences op->sk."
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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 BCM socket syscalls (sendmsg with RX_SETUP/SETTIMER/ival2 throttling and RX_DELETE); CAN frames can be injected locally via loopback without physical bus access.\nAC:L - The attacker controls both sides of the race by concurrently issuing RX_DELETE teardown and delivering matching CAN frames (e.g., via threads or paired BCM/RAW sockets), making the thrtimer re-arm UAF reliably triggerable.\nPR:L - No kernel capability check gates AF_CAN/CAN_BCM socket creation or bcm_sendmsg opcodes; any unprivileged local user with socket access (including via user namespaces with vcan) can reach the vulnerable path.\nUI:N - No victim interaction is required; the attacker self-triggers the race through their own BCM socket operations and locally injected CAN traffic.\nS:U - Impact is confined to kernel memory corruption and local privilege escalation within the same kernel security boundary, not a cross-boundary escape such as VM or IOMMU bypass.\nC:H - The thrtimer UAF dereferences freed bcm_op fields (locks, frame buffers, op->sk) in bcm_rx_thr_handler/bcm_send_to_user, enabling attacker-controlled heap reuse and arbitrary kernel memory disclosure.\nI:H - UAF on the bcm_op slab object allows heap spraying to corrupt function pointers, timers, and sock structures, providing a standard path to arbitrary kernel writes and local privilege escalation.\nA:H - The freed-op dereference in the hrtimer softirq path causes kernel oops/panic under normal exploitation attempts, and successful memory corruption can crash or hang 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": "85cd41070df992d3c0dfd828866fdd243d3b774a",
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"lessThan": "de5fce46637de05bef56ec08528127676eb6fc9b",
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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": "f34f2a18e47b73e48f90a757e1f4aaa8c7d665a1",
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"lessThan": "036a8c320ca11bc912e8027adcfad14b326f067e",
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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": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386",
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"lessThan": "3cf4fd5316f449811d8baf1bc6978ef5a7b743a9",
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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": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386",
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"lessThan": "4177762f70646ac48a2af382e45a795cbd295198",
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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": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386",
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"lessThan": "6fd08e8d826c3aa4cc7021f5f9cdbb7fa7441d3f",
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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": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386",
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"lessThan": "cd830e0bc25ee2d38cbfbdbb3cd77c5f53b2b6d5",
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"status": "affected",
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},
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{
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"version": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386",
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"lessThan": "ce2d4b121fb7545e1ed588e860c8e5fd5ad45224",
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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": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386",
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"lessThan": "68973f9db76144825e4f35dfdc80fb8279eb2d57",
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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": "fbac09a3b8890003c0c55294c00709f3ae5501bb",
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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": "5b48f5711f1c630841ab78dcc061de902f0e37bf",
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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": "edb4baffb9483141a50fb7f7146cfe4a4c0c2db8",
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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": "5.10.130",
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"lessThan": "5.10.265",
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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": "5.15.54",
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"lessThan": "5.15.216",
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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": "4.19.252",
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"lessThan": "4.20",
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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": "5.4.205",
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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": "5.18.11",
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"lessThan": "5.19",
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"status": "affected",
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"versionType": "semver"
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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": "5.19",
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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": "5.19",
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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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},
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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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},
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{
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"version": "6.1.178",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.145",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.97",
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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": "6.18.40",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10.130",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/de5fce46637de05bef56ec08528127676eb6fc9b"
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},
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{
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"url": "https://git.kernel.org/stable/c/036a8c320ca11bc912e8027adcfad14b326f067e"
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},
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{
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"url": "https://git.kernel.org/stable/c/3cf4fd5316f449811d8baf1bc6978ef5a7b743a9"
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},
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{
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"url": "https://git.kernel.org/stable/c/4177762f70646ac48a2af382e45a795cbd295198"
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},
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{
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"url": "https://git.kernel.org/stable/c/6fd08e8d826c3aa4cc7021f5f9cdbb7fa7441d3f"
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},
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{
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"url": "https://git.kernel.org/stable/c/cd830e0bc25ee2d38cbfbdbb3cd77c5f53b2b6d5"
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},
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{
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"url": "https://git.kernel.org/stable/c/ce2d4b121fb7545e1ed588e860c8e5fd5ad45224"
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},
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{
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"url": "https://git.kernel.org/stable/c/68973f9db76144825e4f35dfdc80fb8279eb2d57"
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}
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],
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"title": "can: bcm: defer rx_op deallocation to workqueue to fix thrtimer UAF",
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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-2026-72123",
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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": "2026-10-16T18:42:12.952847Z"
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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": "2026-10-16T18:44:57.598Z"
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}
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}
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]
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}
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} |