CVE-2026-72119 (GCVE-0-2026-72119)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-08-19 16:36
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
can: bcm: extend bcm_tx_lock usage for data and timer updates
Stage new CAN frame content for an existing tx op into a kmalloc()'d
buffer and validate it there, mirroring the approach already used in
bcm_rx_setup(). Only copy the validated data into op->frames while
holding op->bcm_tx_lock, so bcm_can_tx() and bcm_tx_timeout_handler()
can no longer observe a partially updated or unvalidated frame.
Add a missing error path for memcpy_from_msg() when copying CAN frame
data from userspace.
Also move the kt_ival1/kt_ival2/ival1/ival2 updates in bcm_tx_setup()
under op->bcm_tx_lock, and read kt_ival1/kt_ival2/count under the same
lock in bcm_tx_set_expiry() and bcm_tx_timeout_handler(), closing the
torn 64-bit ktime_t read on 32-bit platforms.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 7595de7bc56e0e52b74e56c90f7e247bf626d628 Version: fbd8fdc2b218e979cfe422b139b8f74c12419d1f Version: 2a437b86ac5a9893c902f30ef66815bf13587bf6 Version: 76c84c3728178b2d38d5604e399dfe8b0752645e Version: cc55dd28c20a6611e30596019b3b2f636819a4c0 Version: c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 Version: c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 Version: c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 Version: 8f1c022541bf5a923c8d6fa483112c15250f30a4 Version: c4e8a172501e677ebd8ea9d9161d97dc4df56fbd 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": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/can/bcm.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "a538b072ee074c9b41b9d9c15a6861a963e30755",
"status": "affected",
"version": "7595de7bc56e0e52b74e56c90f7e247bf626d628",
"versionType": "git"
},
{
"lessThan": "63422347b4c782f429748b2a09cd3cf3b77e6abd",
"status": "affected",
"version": "fbd8fdc2b218e979cfe422b139b8f74c12419d1f",
"versionType": "git"
},
{
"lessThan": "37917e432e50b7de2b64230974380132a30f7270",
"status": "affected",
"version": "2a437b86ac5a9893c902f30ef66815bf13587bf6",
"versionType": "git"
},
{
"lessThan": "52f06e7603780de100233713ddaf971d422e10ef",
"status": "affected",
"version": "76c84c3728178b2d38d5604e399dfe8b0752645e",
"versionType": "git"
},
{
"lessThan": "972fd66bb08fdef1090abe43196ca8da07216d13",
"status": "affected",
"version": "cc55dd28c20a6611e30596019b3b2f636819a4c0",
"versionType": "git"
},
{
"lessThan": "bd46f55dec608daa44b45dcf3328517630ad8e40",
"status": "affected",
"version": "c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7",
"versionType": "git"
},
{
"lessThan": "337f966c00662d81ad82cf5a4bbb150b2e32c0d4",
"status": "affected",
"version": "c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7",
"versionType": "git"
},
{
"lessThan": "12ce799f7ab1e05bd8fbf79e46f403bfe5597ebc",
"status": "affected",
"version": "c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7",
"versionType": "git"
},
{
"status": "affected",
"version": "8f1c022541bf5a923c8d6fa483112c15250f30a4",
"versionType": "git"
},
{
"status": "affected",
"version": "c4e8a172501e677ebd8ea9d9161d97dc4df56fbd",
"versionType": "git"
},
{
"lessThan": "5.10.265",
"status": "affected",
"version": "5.10.238",
"versionType": "semver"
},
{
"lessThan": "5.15.216",
"status": "affected",
"version": "5.15.185",
"versionType": "semver"
},
{
"lessThan": "6.1.183",
"status": "affected",
"version": "6.1.141",
"versionType": "semver"
},
{
"lessThan": "6.6.148",
"status": "affected",
"version": "6.6.93",
"versionType": "semver"
},
{
"lessThan": "6.12.101",
"status": "affected",
"version": "6.12.31",
"versionType": "semver"
},
{
"lessThan": "5.5",
"status": "affected",
"version": "5.4.294",
"versionType": "semver"
},
{
"lessThan": "6.15",
"status": "affected",
"version": "6.14.9",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/can/bcm.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"lessThan": "6.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.265",
"versionStartIncluding": "5.10.238",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "5.15.185",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "6.1.141",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.148",
"versionStartIncluding": "6.6.93",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.101",
"versionStartIncluding": "6.12.31",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
"versionStartIncluding": "6.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "6.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.4.294",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.14.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: extend bcm_tx_lock usage for data and timer updates\n\nStage new CAN frame content for an existing tx op into a kmalloc()\u0027d\nbuffer and validate it there, mirroring the approach already used in\nbcm_rx_setup(). Only copy the validated data into op-\u003eframes while\nholding op-\u003ebcm_tx_lock, so bcm_can_tx() and bcm_tx_timeout_handler()\ncan no longer observe a partially updated or unvalidated frame.\n\nAdd a missing error path for memcpy_from_msg() when copying CAN frame\ndata from userspace.\n\nAlso move the kt_ival1/kt_ival2/ival1/ival2 updates in bcm_tx_setup()\nunder op-\u003ebcm_tx_lock, and read kt_ival1/kt_ival2/count under the same\nlock in bcm_tx_set_expiry() and bcm_tx_timeout_handler(), closing the\ntorn 64-bit ktime_t read on 32-bit platforms."
}
],
"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 - The bug is reached only through PF_CAN/CAN_BCM socket sendmsg() TX_SETUP updates racing hrtimer-driven bcm_can_tx(); it is not triggered by remote network services or CAN bus traffic alone.\nAC:L - The attacker controls both sides of the race by creating cyclic TX ops with STARTTIMER/SETTIMER and repeatedly issuing TX_SETUP while the softirq hrtimer fires, making the window reliably winnable without external timing luck.\nPR:L - bcm_sendmsg()/bcm_connect() enforce no capability checks; any local user with access to a CAN interface (including vcan created with CAP_NET_ADMIN inside an unprivileged user namespace) can open BCM sockets and drive TX_SETUP.\nUI:N - Exploitation requires only the attacker opening a BCM socket and sending TX_SETUP messages; no victim interaction such as mounting filesystems or opening files is needed.\nS:U - Impact is confined to kernel memory/state corruption and local privilege effects on the host running CAN BCM; it does not cross a VM, container, or IOMMU security boundary by itself.\nC:H - Racing updates can let bcm_can_tx() transmit partially updated or unvalidated frames (e.g., len\u003e64) before bcm_tx_setup() rejects them, and many CAN driver xmit paths memcpy(cf-\u003edata, cf-\u003elen) trusting len, causing kernel out-of-bounds reads.\nI:H - Concurrent unsynchronized writes to op-\u003eframes, flags, count, and ktime_t timer fields corrupt shared in-kernel BCM state that directly feeds skb construction and driver transmission, providing attacker-influenced memory corruption primitives.\nA:H - Observing torn/unvalidated frames in bcm_can_tx() during active timers can trigger kernel WARN/Oops/panic via out-of-bounds accesses in CAN drivers, and torn ktime_t/count reads can disrupt cyclic transmission causing denial of service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:36:13.917Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/a538b072ee074c9b41b9d9c15a6861a963e30755"
},
{
"url": "https://git.kernel.org/stable/c/63422347b4c782f429748b2a09cd3cf3b77e6abd"
},
{
"url": "https://git.kernel.org/stable/c/37917e432e50b7de2b64230974380132a30f7270"
},
{
"url": "https://git.kernel.org/stable/c/52f06e7603780de100233713ddaf971d422e10ef"
},
{
"url": "https://git.kernel.org/stable/c/972fd66bb08fdef1090abe43196ca8da07216d13"
},
{
"url": "https://git.kernel.org/stable/c/bd46f55dec608daa44b45dcf3328517630ad8e40"
},
{
"url": "https://git.kernel.org/stable/c/337f966c00662d81ad82cf5a4bbb150b2e32c0d4"
},
{
"url": "https://git.kernel.org/stable/c/12ce799f7ab1e05bd8fbf79e46f403bfe5597ebc"
}
],
"title": "can: bcm: extend bcm_tx_lock usage for data and timer updates",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72119",
"datePublished": "2026-08-15T05:52:58.479Z",
"dateReserved": "2026-08-09T03:40:39.906Z",
"dateUpdated": "2026-08-19T16:36:13.917Z",
"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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