{"id":"CVE-2026-80958","title":"dm-pcache: clamp the tail kset read to the segment data region","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: clamp the tail kset read to the segment data region\n\nThe tail-kset read in cache_replay(), the writeback worker and the GC\nworker bounds its length by PCACHE…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","cwe":["CWE-125"],"vendor":"Linux","product":"Linux","affected":["Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 2cd9776fe3f2d88ec22c36d3c8ba09fbf9d5500c","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 1ab55354368d071ebaee4d8c82313955eab65a04","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < becf07e2b0053027495ecd671b1f82fb2e615f68","Linux 6.18"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:45:42.221Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80958","references":[{"url":"https://git.kernel.org/stable/c/2cd9776fe3f2d88ec22c36d3c8ba09fbf9d5500c"},{"url":"https://git.kernel.org/stable/c/1ab55354368d071ebaee4d8c82313955eab65a04"},{"url":"https://git.kernel.org/stable/c/becf07e2b0053027495ecd671b1f82fb2e615f68"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80958.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80958"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532108"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80958"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80958"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80958.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00164,"epssPercentile":0.05572,"scores":{"cna":7.1,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80958","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: clamp the tail kset read to the segment data region\n\nThe tail-kset read in cache_replay(), the writeback worker and the GC\nworker bounds its length by PCACHE_SEG_SIZE - seg_off, the raw segment\nsize rather than the data region. A tail near the segment end reads past\nthe segment data into the following control area.\n\nClamp the read to cache_seg_remain(), the data region.\n\n## Affected\n\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 2cd9776fe3f2d88ec22c36d3c8ba09fbf9d5500c`\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 1ab55354368d071ebaee4d8c82313955eab65a04`\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < becf07e2b0053027495ecd671b1f82fb2e615f68`\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-2026-80958.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224806,"id":"CVE-2026-80958","ts":1792401555291,"field":"cvss","old":"5.5","new":"7.1"},{"seq":224805,"id":"CVE-2026-80958","ts":1792401555291,"field":"severity","old":"medium","new":"high"},{"seq":204235,"id":"CVE-2026-80958","ts":1789490240447,"field":"cvss","old":"5.1","new":"5.5"},{"seq":202937,"id":"CVE-2026-80958","ts":1789403733024,"field":"cvss","old":"7.1","new":"5.1"},{"seq":202936,"id":"CVE-2026-80958","ts":1789403733024,"field":"severity","old":"high","new":"medium"},{"seq":183612,"id":"CVE-2026-80958","ts":1789356676101,"field":"cvss","old":"7.1","new":"5.1"},{"seq":183611,"id":"CVE-2026-80958","ts":1789356676101,"field":"severity","old":"high","new":"medium"},{"seq":153142,"id":"CVE-2026-80958","ts":1789285349215,"field":"cvss","old":null,"new":"7.1"},{"seq":153141,"id":"CVE-2026-80958","ts":1789285349215,"field":"severity","old":"none","new":"high"},{"seq":109582,"id":"CVE-2026-80958","ts":1789183732503,"field":"cvss","old":null,"new":"5.1"},{"seq":109581,"id":"CVE-2026-80958","ts":1789183732503,"field":"severity","old":"none","new":"medium"}]}