{"id":"CVE-2026-80956","title":"kernel: dm-pcache: only hand out initialized cache segments (CVE-2026-80956)","summary":"A flaw was found in the Linux kernel's `dm-pcache` component. A crafted image can cause the `get_cache_segment()` function to return an uninitialized cache segment. This uninitialized segment, containing a null data pointer, is then used b…","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-824","vendor":"Red Hat","product":"Linux","affected":["Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 83e3116283ed2c6a6a1fa662862a4b4d7d2701a2","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 692037ae1a7cfacc2f0c22c6e034c1dfee0e553f","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 2df0fc042e299bae3c0f60ea5cd2af9285658e9f","Linux 6.18"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T17:36:15+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80956.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80956.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80956"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532400"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80956"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80956"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80956.mbox"},{"url":"https://git.kernel.org/stable/c/83e3116283ed2c6a6a1fa662862a4b4d7d2701a2"},{"url":"https://git.kernel.org/stable/c/692037ae1a7cfacc2f0c22c6e034c1dfee0e553f"},{"url":"https://git.kernel.org/stable/c/2df0fc042e299bae3c0f60ea5cd2af9285658e9f"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00198,"epssPercentile":0.09836,"ingestedAt":"2026-09-14T00:35:28.532Z","slug":"CVE-2026-80956","body":"## Overview\n\nA flaw was found in the Linux kernel's `dm-pcache` component. A crafted image can cause the `get_cache_segment()` function to return an uninitialized cache segment. This uninitialized segment, containing a null data pointer, is then used by `cache_kset_close()` without a proper null check. This can lead to a system crash, resulting in a Denial of Service (DoS).\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-2026-80956.json)\n\n**kernel: dm-pcache: only hand out initialized cache segments** — 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":204239,"id":"CVE-2026-80956","ts":1789490240474,"field":"cvss","old":null,"new":"5.5"},{"seq":204238,"id":"CVE-2026-80956","ts":1789490240474,"field":"severity","old":"none","new":"medium"},{"seq":147287,"id":"CVE-2026-80956","ts":1789270207156,"field":"cvss","old":null,"new":"4.4"},{"seq":147286,"id":"CVE-2026-80956","ts":1789270207156,"field":"severity","old":"none","new":"medium"},{"seq":109046,"id":"CVE-2026-80956","ts":1789183730095,"field":"cvss","old":null,"new":"4.4"},{"seq":109045,"id":"CVE-2026-80956","ts":1789183730095,"field":"severity","old":"none","new":"medium"}]}