CVE-2026-72120 (GCVE-0-2026-72120)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-08-17 05:40
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
can: bcm: add missing rcu list annotations and operations
sashiko-bot remarked the missing use of list_add_rcu() in
bcm_[rx|tx]_setup() to have a proper initialized bcm_op structure
when bcm_proc_show() traverses the bcm_op's under rcu_read_lock().
To cover all initial settings of the bcm_op's the list_add_rcu() calls
are moved to the end of the setup code.
While at it, also fix the mirroring removal side: bcm_release() called
bcm_remove_op() - which frees the op via call_rcu() - on ops that were
still linked in bo->tx_ops/bo->rx_ops, without list_del_rcu() first.
Unlink each op with list_del_rcu() before handing it to bcm_remove_op(),
matching the existing pattern in bcm_delete_tx_op()/bcm_delete_rx_op().
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 659701c0b954ccdb4a916a4ad59bbc16e726d42c Version: 0622846db728a5332b917c797c733e202c4620ae Version: 6d7d458c41b98a5c1670cbd36f2923c37de51cf5 Version: 1f912f8484e9c4396378c39460bbea0af681f319 Version: 63567ecd99a24495208dc860d50fb17440043006 Version: dac5e6249159ac255dad9781793dbe5908ac9ddb Version: dac5e6249159ac255dad9781793dbe5908ac9ddb Version: dac5e6249159ac255dad9781793dbe5908ac9ddb Version: 19f553a1ddf260da6570ed8f8d91a8c87f49b63a Version: 7c9db92d5f0eadca30884af75c53d601edc512ee Version: 5.10.238 ≤ Version: 5.15.185 ≤ Version: 6.1.141 ≤ Version: 6.6.93 ≤ Version: 6.12.31 ≤ Version: 5.4.294 ≤ Version: 6.14.9 ≤ |
||
{
"containers": {
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"programFiles": [
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"status": "affected",
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},
{
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"status": "affected",
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},
{
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"status": "affected",
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},
{
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"status": "affected",
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},
{
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"status": "affected",
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{
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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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"vendor": "Linux",
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},
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"version": "0",
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},
{
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},
{
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"version": "5.15.212",
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},
{
"lessThanOrEqual": "6.1.*",
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},
{
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},
{
"lessThanOrEqual": "6.12.*",
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},
{
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{
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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},
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{
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{
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{
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{
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}
],
"negate": false,
"operator": "OR"
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}
],
"descriptions": [
{
"lang": "en",
"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\u0027s under rcu_read_lock().\n\nTo cover all initial settings of the bcm_op\u0027s 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-\u003etx_ops/bo-\u003erx_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()."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires local syscalls (socket/connect/sendmsg/close on PF_CAN/CAN_BCM) and/or reading /proc/net/can-bcm/\u003cinode\u003e; 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\u2014concurrent TX_SETUP/RX_SETUP or socket close while repeatedly reading the world-readable proc entry\u2014so 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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:40:33.370Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/8357255e56dc1aaa437e3c53ee9385de984e0d57"
},
{
"url": "https://git.kernel.org/stable/c/8e1c7257c81577130f5ce90f69b2a2c3ce63f957"
},
{
"url": "https://git.kernel.org/stable/c/eb1c26eab4d1f0b4450439b4b88c3e73faf1da98"
},
{
"url": "https://git.kernel.org/stable/c/f53bdab85e64eb57d6899a30d1307fd5a3639cc7"
},
{
"url": "https://git.kernel.org/stable/c/4e22e8b505f877573bbdfdbcb680babad9b2f7a1"
},
{
"url": "https://git.kernel.org/stable/c/b06a4a397ac826603f39875cb7c7819a41365196"
},
{
"url": "https://git.kernel.org/stable/c/30f7bb922cb7e7f072a56c7cb7a5efccd2ceca1d"
},
{
"url": "https://git.kernel.org/stable/c/7b2c3eabc4dafc062a25e10711154f2107526a78"
}
],
"title": "can: bcm: add missing rcu list annotations and operations",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72120",
"datePublished": "2026-08-15T05:52:59.226Z",
"dateReserved": "2026-08-09T03:40:39.907Z",
"dateUpdated": "2026-08-17T05:40:33.370Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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