{"id":"CVE-2026-80959","title":"kernel: dm-pcache: bound the persisted tail-position offset (CVE-2026-80959)","summary":"A flaw was found in the Linux kernel's device-mapper persistent cache (dm-pcache) component. A local attacker with administrative privileges (CAP_SYS_ADMIN) could provide a specially crafted cache device, leading to an out-of-bounds read. …","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-125","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T17:36:25+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80959.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80959.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80959"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532361"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80959"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80959"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80959.mbox"},{"url":"https://git.kernel.org/stable/c/8bf7a06ca3c1611809725f58cfd573f2ffbda75f"},{"url":"https://git.kernel.org/stable/c/d1898576090a10d2ac2715218a652e78fb65a6b0"},{"url":"https://git.kernel.org/stable/c/ffd9a214a94f9928e54856f42b1cc3e33fb10e36"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00127,"epssPercentile":0.02713,"scores":{"vendor":5.1,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80959","body":"## Overview\n\nA flaw was found in the Linux kernel's device-mapper persistent cache (dm-pcache) component. A local attacker with administrative privileges (CAP_SYS_ADMIN) could provide a specially crafted cache device, leading to an out-of-bounds read. This vulnerability allows reading past the intended segment data, which may result in information disclosure or system instability.\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-2026-80959.json)\n\n**kernel: dm-pcache: bound the persisted tail-position offset** — 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":204240,"id":"CVE-2026-80959","ts":1789490240483,"field":"cvss","old":"5.1","new":"5.5"},{"seq":202933,"id":"CVE-2026-80959","ts":1789403733007,"field":"cvss","old":"7.8","new":"5.1"},{"seq":202932,"id":"CVE-2026-80959","ts":1789403733007,"field":"severity","old":"high","new":"medium"},{"seq":183610,"id":"CVE-2026-80959","ts":1789356676093,"field":"cvss","old":"7.8","new":"5.1"},{"seq":183609,"id":"CVE-2026-80959","ts":1789356676093,"field":"severity","old":"high","new":"medium"},{"seq":153144,"id":"CVE-2026-80959","ts":1789285349224,"field":"cvss","old":null,"new":"7.8"},{"seq":153143,"id":"CVE-2026-80959","ts":1789285349224,"field":"severity","old":"none","new":"high"},{"seq":147341,"id":"CVE-2026-80959","ts":1789270210527,"field":"cvss","old":null,"new":"5.1"},{"seq":147340,"id":"CVE-2026-80959","ts":1789270210527,"field":"severity","old":"none","new":"medium"},{"seq":109100,"id":"CVE-2026-80959","ts":1789183730304,"field":"cvss","old":null,"new":"5.1"},{"seq":109099,"id":"CVE-2026-80959","ts":1789183730304,"field":"severity","old":"none","new":"medium"}]}