CVE-2026-80991 (GCVE-0-2026-80991)
Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-10-30 12:31
VLAI
EPSS
VEX
Title
net: ravb: serialize PTP clock teardown
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: ravb: serialize PTP clock teardown
ravb_ptp_interrupt() can race with ravb_ptp_stop() and pass the clock to
ptp_clock_event() while ptp_clock_unregister() is freeing it. This can
lead to a use-after-free.
Use READ_ONCE() and WRITE_ONCE() for lockless access to the clock pointer.
Atomically detach it with xchg() before disabling PTP interrupts, then
synchronize all IRQs which can invoke ravb_ptp_interrupt() before
unregistering the detached clock.
A handler which read the old pointer completes before the clock is
unregistered, while later handlers read NULL and skip the event.
Severity
7.8 (High)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < 0400b9c5608933289bcacc3886dd3e4f6b7695f1
(git)
Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < b917f37bfcce919a969d66a044580a95b11df31c (git) Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < 695acb5534a9e366efb47b40c7487fc56488b09b (git) Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < 67a82e6f886beed0de8f8da08bb767e68fba952d (git) Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < 66b50c31419e7946e9aa325a468ad9b64c961a25 (git) Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < 1cb9663789c5b7a12fcd419fcca6d6254c398252 (git) |
guessed | |
| Linux | Linux |
Affected:
4.2
Unaffected: 0 , < 4.2 (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"product": "Linux",
"programFiles": [
"drivers/net/ethernet/renesas/ravb.h",
"drivers/net/ethernet/renesas/ravb_main.c",
"drivers/net/ethernet/renesas/ravb_ptp.c"
],
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},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/renesas/ravb.h",
"drivers/net/ethernet/renesas/ravb_main.c",
"drivers/net/ethernet/renesas/ravb_ptp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.2"
},
{
"lessThan": "4.2",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.191",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.160",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.109",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.50",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.4",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "4.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ravb: serialize PTP clock teardown\n\nravb_ptp_interrupt() can race with ravb_ptp_stop() and pass the clock to\nptp_clock_event() while ptp_clock_unregister() is freeing it. This can\nlead to a use-after-free.\n\nUse READ_ONCE() and WRITE_ONCE() for lockless access to the clock pointer.\nAtomically detach it with xchg() before disabling PTP interrupts, then\nsynchronize all IRQs which can invoke ravb_ptp_interrupt() before\nunregistering the detached clock.\n\nA handler which read the old pointer completes before the clock is\nunregistered, while later handlers read NULL and skip the event."
}
],
"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 UAF is reached from the ravb gPTP IRQ handler (ravb_interrupt/ravb_multi_interrupt \u2192 ravb_ptp_interrupt \u2192 ptp_clock_event) racing local ravb_ptp_stop teardown (close, suspend, TX-timeout work, ethtool ringparam). GIS_PTCF capture IRQs come from the on-chip AVB timer, not from parsing received Ethernet frames.\nAC:L - The attacker drives both sides: ordinary sockets or automotive idle autosuspend trigger ravb_ptp_stop, and PTP_EXTTS_REQUEST on /dev/ptpX (write fd, no CAP_SYS_TIME) enables capture IRQs. Pre-fix stop cleared GIC then called ptp_clock_unregister without synchronize_irq, so an in-flight handler can be raced repeatedly.\nPR:L - On Renesas R-Car/RZ automotive and industrial systems, unprivileged traffic arms ravb_tx_timeout_work and platform autosleep calls ravb_close without CAP_NET_ADMIN; EXTTS enable needs only a writable PTP chardev, not host root. This matches CVE-2025-21801 and CVE-2023-52509 ravb scoring.\nUI:N - Interface teardown runs from the TX watchdog or from automatic suspend/idle power management on the affected platforms, with no separate victim user action required.\nS:U - The use-after-free corrupts the host kernel\u0027s struct ptp_clock heap object within a single kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - ptp_clock_event takes ptp-\u003etsevqs_lock and walks the timestamp queue list after ptp_clock_release has kfree\u0027d the clock, so reclaiming that slab provides an arbitrary kernel-memory read primitive.\nI:H - The same IRQ-context UAF writes via enqueue_external_timestamp into list-queue objects the attacker can reclaim, yielding a kernel heap write primitive suitable for control-flow hijacking.\nA:H - Use-after-free of struct ptp_clock in hardirq context causes a kernel oops or panic and takes down the system\u0027s primary Ethernet interface."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:31:37.536Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0400b9c5608933289bcacc3886dd3e4f6b7695f1"
},
{
"url": "https://git.kernel.org/stable/c/b917f37bfcce919a969d66a044580a95b11df31c"
},
{
"url": "https://git.kernel.org/stable/c/695acb5534a9e366efb47b40c7487fc56488b09b"
},
{
"url": "https://git.kernel.org/stable/c/67a82e6f886beed0de8f8da08bb767e68fba952d"
},
{
"url": "https://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25"
},
{
"url": "https://git.kernel.org/stable/c/1cb9663789c5b7a12fcd419fcca6d6254c398252"
}
],
"title": "net: ravb: serialize PTP clock teardown",
"x_generator": {
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}
}
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80991",
"datePublished": "2026-09-11T19:42:48.187Z",
"dateReserved": "2026-08-26T14:34:25.811Z",
"dateUpdated": "2026-10-30T12:31:37.536Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-80991",
"date": "2026-11-08",
"epss": "0.00164",
"percentile": "0.05685"
},
"microsoft_vex": {
"current_release_date": "2026-11-07T01:43:45.000Z",
"cve": "CVE-2026-80991",
"id": "msrc_CVE-2026-80991",
"initial_release_date": "2026-09-13T01:04:10.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "4",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "net: ravb: serialize PTP clock teardown",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80991.json",
"version": "7"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/renesas/ravb.h",
"drivers/net/ethernet/renesas/ravb_main.c",
"drivers/net/ethernet/renesas/ravb_ptp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"versionType": "git"
},
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{
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"versionType": "git"
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{
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"versionType": "git"
},
{
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{
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"product": "Linux",
"programFiles": [
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"drivers/net/ethernet/renesas/ravb_main.c",
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.2"
},
{
"lessThan": "4.2",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
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"version": "6.12.109",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
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}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ravb: serialize PTP clock teardown\n\nravb_ptp_interrupt() can race with ravb_ptp_stop() and pass the clock to\nptp_clock_event() while ptp_clock_unregister() is freeing it. This can\nlead to a use-after-free.\n\nUse READ_ONCE() and WRITE_ONCE() for lockless access to the clock pointer.\nAtomically detach it with xchg() before disabling PTP interrupts, then\nsynchronize all IRQs which can invoke ravb_ptp_interrupt() before\nunregistering the detached clock.\n\nA handler which read the old pointer completes before the clock is\nunregistered, while later handlers read NULL and skip the event."
}
],
"id": "CVE-2026-80991",
"lastModified": "2026-10-30T13:20:15.297",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-09-11T20:19:05.993",
"references": [
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0400b9c5608933289bcacc3886dd3e4f6b7695f1"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/1cb9663789c5b7a12fcd419fcca6d6254c398252"
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"url": "https://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25"
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"url": "https://git.kernel.org/stable/c/67a82e6f886beed0de8f8da08bb767e68fba952d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/695acb5534a9e366efb47b40c7487fc56488b09b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b917f37bfcce919a969d66a044580a95b11df31c"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-07T04:53:51+00:00",
"cve": "CVE-2026-80991",
"id": "CVE-2026-80991",
"initial_release_date": "2026-09-11T00:00:00+00:00",
"product_status:known_not_affected": "203",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: ravb: serialize PTP clock teardown",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80991.json",
"version": "3"
}
}
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.