{"id":"CVE-2026-80960","title":"kernel: dm-pcache: validate on-media seg_num against the cache device size (CVE-2026-80960)","summary":"A flaw was found in the Linux kernel's dm-pcache component. A local attacker with CAP_SYS_ADMIN capabilities can exploit this vulnerability by supplying a specially crafted cache device. The seg_num value, which dictates the size of cache …","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-787","vendor":"Red Hat","product":"Linux","affected":["Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 91b93fe5cf4d62d5ecc642a6c8f15a3c11b00e3c","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < e889c0ee81165fc90aad2979b51f930f77895703","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 62d92e45abe9e087370f9fc5d876b95673aced34","Linux 6.18"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T17:36:30+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80960.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80960.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80960"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532483"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80960"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80960"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80960.mbox"},{"url":"https://git.kernel.org/stable/c/91b93fe5cf4d62d5ecc642a6c8f15a3c11b00e3c"},{"url":"https://git.kernel.org/stable/c/e889c0ee81165fc90aad2979b51f930f77895703"},{"url":"https://git.kernel.org/stable/c/62d92e45abe9e087370f9fc5d876b95673aced34"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00198,"epssPercentile":0.09822,"ingestedAt":"2026-09-14T00:35:28.532Z","slug":"CVE-2026-80960","body":"## Overview\n\nA flaw was found in the Linux kernel's dm-pcache component. A local attacker with CAP_SYS_ADMIN capabilities can exploit this vulnerability by supplying a specially crafted cache device. The seg_num value, which dictates the size of cache segments, is not adequately validated against the actual device size. This oversight can lead to an out-of-bounds write of 12 KiB into the kernel heap during table load, potentially resulting in a denial of service or other system compromise.\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-2026-80960.json)\n\n**kernel: dm-pcache: validate on-media seg_num against the cache device size** — 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":204234,"id":"CVE-2026-80960","ts":1789490240439,"field":"cvss","old":null,"new":"5.5"},{"seq":204233,"id":"CVE-2026-80960","ts":1789490240439,"field":"severity","old":"none","new":"medium"},{"seq":147133,"id":"CVE-2026-80960","ts":1789270195956,"field":"cvss","old":null,"new":"5.7"},{"seq":147132,"id":"CVE-2026-80960","ts":1789270195956,"field":"severity","old":"none","new":"medium"},{"seq":108886,"id":"CVE-2026-80960","ts":1789183729407,"field":"cvss","old":null,"new":"5.7"},{"seq":108885,"id":"CVE-2026-80960","ts":1789183729407,"field":"severity","old":"none","new":"medium"}]}