{"id":"CVE-2026-80991","title":"net: ravb: serialize PTP clock teardown","summary":"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 free…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-364"],"vendor":"Linux","product":"Linux","affected":["Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < b917f37bfcce919a969d66a044580a95b11df31c","Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 695acb5534a9e366efb47b40c7487fc56488b09b","Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 67a82e6f886beed0de8f8da08bb767e68fba952d","Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 66b50c31419e7946e9aa325a468ad9b64c961a25","Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 1cb9663789c5b7a12fcd419fcca6d6254c398252","Linux 4.2"],"published":"2026-09-11","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:47:22.150Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80991","references":[{"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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80991.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80991"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532440"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80991"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80991"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80991.mbox"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00164,"epssPercentile":0.05539,"scores":{"cna":7.8,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80991","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < b917f37bfcce919a969d66a044580a95b11df31c`\n- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 695acb5534a9e366efb47b40c7487fc56488b09b`\n- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 67a82e6f886beed0de8f8da08bb767e68fba952d`\n- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 66b50c31419e7946e9aa325a468ad9b64c961a25`\n- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 1cb9663789c5b7a12fcd419fcca6d6254c398252`\n- `Linux 4.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80991.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224786,"id":"CVE-2026-80991","ts":1792401541951,"field":"cvss","old":"5.5","new":"7.8"},{"seq":224785,"id":"CVE-2026-80991","ts":1792401541951,"field":"severity","old":"medium","new":"high"},{"seq":204156,"id":"CVE-2026-80991","ts":1789490234391,"field":"cvss","old":"4.4","new":"5.5"},{"seq":203033,"id":"CVE-2026-80991","ts":1789403733434,"field":"cvss","old":"7.8","new":"4.4"},{"seq":203032,"id":"CVE-2026-80991","ts":1789403733434,"field":"severity","old":"high","new":"medium"},{"seq":183811,"id":"CVE-2026-80991","ts":1789356677491,"field":"cvss","old":"7.8","new":"4.4"},{"seq":183810,"id":"CVE-2026-80991","ts":1789356677491,"field":"severity","old":"high","new":"medium"},{"seq":153178,"id":"CVE-2026-80991","ts":1789285349423,"field":"cvss","old":null,"new":"7.8"},{"seq":153177,"id":"CVE-2026-80991","ts":1789285349423,"field":"severity","old":"none","new":"high"},{"seq":147233,"id":"CVE-2026-80991","ts":1789270203153,"field":"cvss","old":null,"new":"4.4"},{"seq":147232,"id":"CVE-2026-80991","ts":1789270203153,"field":"severity","old":"none","new":"medium"},{"seq":108984,"id":"CVE-2026-80991","ts":1789183729838,"field":"cvss","old":null,"new":"4.4"},{"seq":108983,"id":"CVE-2026-80991","ts":1789183729838,"field":"severity","old":"none","new":"medium"}]}