{"id":"CVE-2026-80991","title":"kernel: net: ravb: serialize PTP clock teardown (CVE-2026-80991)","summary":"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 fre…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-364","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T20:06:07+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80991.json","references":[{"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"},{"url":"https://git.kernel.org/stable/c/1cb9663789c5b7a12fcd419fcca6d6254c398252"},{"url":"https://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25"},{"url":"https://git.kernel.org/stable/c/67a82e6f886beed0de8f8da08bb767e68fba952d"},{"url":"https://git.kernel.org/stable/c/695acb5534a9e366efb47b40c7487fc56488b09b"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00159,"epssPercentile":0.05431,"scores":{"vendor":4.4,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80991","body":"## Overview\n\nA 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.\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)\n\n**kernel: net: ravb: serialize PTP clock teardown** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"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"}]}