{"id":"CVE-2026-80957","title":"dm-pcache: detect a cycle in the last-kset chain during replay","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: detect a cycle in the last-kset chain during replay\n\ncache_replay() follows the on-media last-kset chain by next_cache_seg_id\nwith no cond_resched(). A forge…","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-835"],"vendor":"Linux","product":"Linux","affected":["Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 663ee2f3824a505b983162de44134e789f8230da","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 5311dfc5cd70edccd110257e3f30b2c1dcd3768d","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 16c3b3a326e70f246a605b3dc27b7f83ba4743e3","Linux 6.18"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:45:41.225Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80957","references":[{"url":"https://git.kernel.org/stable/c/663ee2f3824a505b983162de44134e789f8230da"},{"url":"https://git.kernel.org/stable/c/5311dfc5cd70edccd110257e3f30b2c1dcd3768d"},{"url":"https://git.kernel.org/stable/c/16c3b3a326e70f246a605b3dc27b7f83ba4743e3"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80957.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80957"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532037"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80957"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80957"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80957.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.10629,"ingestedAt":"2026-09-14T00:35:28.532Z","slug":"CVE-2026-80957","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: detect a cycle in the last-kset chain during replay\n\ncache_replay() follows the on-media last-kset chain by next_cache_seg_id\nwith no cond_resched(). A forged chain that points back into a segment it\nhas already visited makes the replay loop follow it forever.\n\nCap the last-kset hops at cache->n_segs; a valid chain visits each segment\nat most once.\n\n## Affected\n\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 663ee2f3824a505b983162de44134e789f8230da`\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 5311dfc5cd70edccd110257e3f30b2c1dcd3768d`\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 16c3b3a326e70f246a605b3dc27b7f83ba4743e3`\n- `Linux 6.18`\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-2026-80957.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":202739,"id":"CVE-2026-80957","ts":1789403715382,"field":"cvss","old":null,"new":"5.5"},{"seq":202738,"id":"CVE-2026-80957","ts":1789403715382,"field":"severity","old":"none","new":"medium"},{"seq":109632,"id":"CVE-2026-80957","ts":1789183732722,"field":"cvss","old":null,"new":"4.4"},{"seq":109631,"id":"CVE-2026-80957","ts":1789183732722,"field":"severity","old":"none","new":"medium"}]}