CVE-2026-80991

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80991", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.811Z", "datePublished": "2026-09-11T19:42:48.187Z", "dateUpdated": "2026-10-30T12:31:37.536Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:31:37.536Z"}, "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": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "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's 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->tsevqs_lock and walks the timestamp queue list after ptp_clock_release has kfree'd 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's primary Ethernet interface."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/renesas/ravb.h", "drivers/net/ethernet/renesas/ravb_main.c", "drivers/net/ethernet/renesas/ravb_ptp.c"], "versions": [{"version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "0400b9c5608933289bcacc3886dd3e4f6b7695f1", "status": "affected", "versionType": "git"}, {"version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "b917f37bfcce919a969d66a044580a95b11df31c", "status": "affected", "versionType": "git"}, {"version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "695acb5534a9e366efb47b40c7487fc56488b09b", "status": "affected", "versionType": "git"}, {"version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "67a82e6f886beed0de8f8da08bb767e68fba952d", "status": "affected", "versionType": "git"}, {"version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "66b50c31419e7946e9aa325a468ad9b64c961a25", "status": "affected", "versionType": "git"}, {"version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "lessThan": "1cb9663789c5b7a12fcd419fcca6d6254c398252", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/renesas/ravb.h", "drivers/net/ethernet/renesas/ravb_main.c", "drivers/net/ethernet/renesas/ravb_ptp.c"], "versions": [{"version": "4.2", "status": "affected"}, {"version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "7.3"}]}]}], "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": {"engine": "bippy-1.2.0"}}}}

{}

{"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": [{"lessThan": "0400b9c5608933289bcacc3886dd3e4f6b7695f1", "status": "affected", "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "versionType": "git"}, {"lessThan": "b917f37bfcce919a969d66a044580a95b11df31c", "status": "affected", "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "versionType": "git"}, {"lessThan": "695acb5534a9e366efb47b40c7487fc56488b09b", "status": "affected", "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "versionType": "git"}, {"lessThan": "67a82e6f886beed0de8f8da08bb767e68fba952d", "status": "affected", "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "versionType": "git"}, {"lessThan": "66b50c31419e7946e9aa325a468ad9b64c961a25", "status": "affected", "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "versionType": "git"}, {"lessThan": "1cb9663789c5b7a12fcd419fcca6d6254c398252", "status": "affected", "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c", "versionType": "git"}]}, {"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"}]}], "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": [{"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"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "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"}

{"bugzilla": {"description": "kernel: Linux kernel: Use-after-free in ravb PTP clock teardown", "id": "2532440", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532440"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-364", "details": ["A flaw was found in the Linux kernel's `net: ravb` module. A race condition exists during the Precision Time Protocol (PTP) clock teardown. This allows the `ravb_ptp_interrupt()` function to attempt to use a PTP clock after it has been freed by `ptp_clock_unregister()`, leading to a use-after-free vulnerability. This could result in system instability, denial of service, or potentially information disclosure."], "name": "CVE-2026-80991", "public_date": "2026-09-11T19:42:48Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80991\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80991\nhttps://git.kernel.org/stable/c/1cb9663789c5b7a12fcd419fcca6d6254c398252\nhttps://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25\nhttps://git.kernel.org/stable/c/67a82e6f886beed0de8f8da08bb767e68fba952d\nhttps://git.kernel.org/stable/c/695acb5534a9e366efb47b40c7487fc56488b09b"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a0d2f20650e81407d8e51ad2cbdc492861c74e9c,695acb5534a9e366efb47b40c7487fc56488b09b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a0d2f20650e81407d8e51ad2cbdc492861c74e9c,67a82e6f886beed0de8f8da08bb767e68fba952d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a0d2f20650e81407d8e51ad2cbdc492861c74e9c,66b50c31419e7946e9aa325a468ad9b64c961a25)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a0d2f20650e81407d8e51ad2cbdc492861c74e9c,1cb9663789c5b7a12fcd419fcca6d6254c398252)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T21:00:12.575407+00:00", "updated": "2026-09-21T02:00:09.678959+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}