{"id":"CVE-2026-80955","title":"kernel: dm-pcache: fix use-after-free and invalid seg operations in kset_replay() (CVE-2026-80955)","summary":"A flaw was found in the Linux kernel's dm-pcache component. This vulnerability, a use-after-free, occurs within the `kset_replay` function when a stale key's segment generation is accessed after it has been freed. This could allow a local …","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-825","vendor":"Red Hat","product":"Linux","affected":["Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 1894fc7a3bab90143dcd26ef8ee27040ef4a7501","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < f39a3e9cc5946473e16d6f5071b2ee0216c56d06","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < c2e894eac398b258f12fdec73ed6ba081047f7b3","Linux 6.18"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T14:48:39+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80955.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80955.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80955"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532031"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80955"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80955"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80955.mbox"},{"url":"https://git.kernel.org/stable/c/1894fc7a3bab90143dcd26ef8ee27040ef4a7501"},{"url":"https://git.kernel.org/stable/c/f39a3e9cc5946473e16d6f5071b2ee0216c56d06"},{"url":"https://git.kernel.org/stable/c/c2e894eac398b258f12fdec73ed6ba081047f7b3"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00157,"epssPercentile":0.0526,"scores":{"vendor":5.5,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80955","body":"## Overview\n\nA flaw was found in the Linux kernel's dm-pcache component. This vulnerability, a use-after-free, occurs within the `kset_replay` function when a stale key's segment generation is accessed after it has been freed. This could allow a local attacker to potentially cause a system crash or lead to other unpredictable system behavior.\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-2026-80955.json)\n\n**kernel: dm-pcache: fix use-after-free and invalid seg operations in kset_replay()** — 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":202763,"id":"CVE-2026-80955","ts":1789403715785,"field":"cvss","old":"7.8","new":"5.5"},{"seq":202762,"id":"CVE-2026-80955","ts":1789403715785,"field":"severity","old":"high","new":"medium"},{"seq":183614,"id":"CVE-2026-80955","ts":1789356676109,"field":"cvss","old":"7.8","new":"4.7"},{"seq":183613,"id":"CVE-2026-80955","ts":1789356676109,"field":"severity","old":"high","new":"medium"},{"seq":153140,"id":"CVE-2026-80955","ts":1789285349207,"field":"cvss","old":null,"new":"7.8"},{"seq":153139,"id":"CVE-2026-80955","ts":1789285349207,"field":"severity","old":"none","new":"high"},{"seq":109634,"id":"CVE-2026-80955","ts":1789183732729,"field":"cvss","old":null,"new":"4.7"},{"seq":109633,"id":"CVE-2026-80955","ts":1789183732729,"field":"severity","old":"none","new":"medium"}]}