{"id":"CVE-2026-80962","title":"dm-pcache: validate geometry fields from on-disk cache_info","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: validate geometry fields from on-disk cache_info\n\ncache_segs_init() iterates cache_info->n_segs times indexing\ncache->segments[], which is sized to the cache…","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-125"],"vendor":"Linux","product":"Linux","affected":["Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < ab5dcde6fa96bc115b85f3621c60e39c66229a90","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 3e19172089ec81132a8a48e802b1034a744209f4","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 32d1809da31094ef76fd98dc1f1a8b55ca1295dd","Linux 6.18"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:45:46.216Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80962","references":[{"url":"https://git.kernel.org/stable/c/ab5dcde6fa96bc115b85f3621c60e39c66229a90"},{"url":"https://git.kernel.org/stable/c/3e19172089ec81132a8a48e802b1034a744209f4"},{"url":"https://git.kernel.org/stable/c/32d1809da31094ef76fd98dc1f1a8b55ca1295dd"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80962.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80962"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532323"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80962"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80962"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80962.mbox"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00173,"epssPercentile":0.06721,"scores":{"cna":7.8,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80962","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: validate geometry fields from on-disk cache_info\n\ncache_segs_init() iterates cache_info->n_segs times indexing\ncache->segments[], which is sized to the cache device geometry, and\nget_seg_id() takes each segment id from the on-media cache_info and the\nper-segment next_seg link. Both come from cache device metadata that is\nonly CRC-protected with a fixed public seed, so whoever supplies the\ncache device on a table load (CAP_SYS_ADMIN) controls them: an oversized\nn_segs or an out-of-range id drives an out-of-bounds access of\ncache->segments[] and a wild CACHE_DEV_SEGMENT() pointer into the device\nmapping -- an out-of-bounds read and write from on-disk data.\n\nReject an n_segs that exceeds the device segment count and a segment id\nthat is out of range before either is used. Valid metadata is unaffected.\n\n## Affected\n\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < ab5dcde6fa96bc115b85f3621c60e39c66229a90`\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 3e19172089ec81132a8a48e802b1034a744209f4`\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 32d1809da31094ef76fd98dc1f1a8b55ca1295dd`\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-2026-80962.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224802,"id":"CVE-2026-80962","ts":1792401553988,"field":"cvss","old":"5.5","new":"7.8"},{"seq":224801,"id":"CVE-2026-80962","ts":1792401553988,"field":"severity","old":"medium","new":"high"},{"seq":204232,"id":"CVE-2026-80962","ts":1789490240430,"field":"cvss","old":"6","new":"5.5"},{"seq":202931,"id":"CVE-2026-80962","ts":1789403732999,"field":"cvss","old":"7.8","new":"6"},{"seq":202930,"id":"CVE-2026-80962","ts":1789403732999,"field":"severity","old":"high","new":"medium"},{"seq":183618,"id":"CVE-2026-80962","ts":1789356676125,"field":"cvss","old":"7.8","new":"6"},{"seq":183617,"id":"CVE-2026-80962","ts":1789356676125,"field":"severity","old":"high","new":"medium"},{"seq":153148,"id":"CVE-2026-80962","ts":1789285349241,"field":"cvss","old":null,"new":"7.8"},{"seq":153147,"id":"CVE-2026-80962","ts":1789285349241,"field":"severity","old":"none","new":"high"},{"seq":147375,"id":"CVE-2026-80962","ts":1789270210657,"field":"cvss","old":null,"new":"6"},{"seq":147374,"id":"CVE-2026-80962","ts":1789270210657,"field":"severity","old":"none","new":"medium"},{"seq":109120,"id":"CVE-2026-80962","ts":1789183730380,"field":"cvss","old":null,"new":"6"},{"seq":109119,"id":"CVE-2026-80962","ts":1789183730380,"field":"severity","old":"none","new":"medium"}]}