{"id":"CVE-2026-93198","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: validate the persisted dirty_tail chain at load\n\nThe writeback worker follows the persisted dirty_tail chain, which is\ndecoded from the cache device independ…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: validate the persisted dirty_tail chain at load\n\nThe writeback worker follows the persisted dirty_tail chain, which is\ndecoded from the cache device independ…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 8195cf3f4a82ef49d9b0651c507ed0784caf23fb","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 4822a030929e0e77aa380722dc42e3e4c9edd346","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b","Linux 6.18"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:18:16.097","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93198","references":[{"url":"https://git.kernel.org/stable/c/4822a030929e0e77aa380722dc42e3e4c9edd346","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8195cf3f4a82ef49d9b0651c507ed0784caf23fb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93198.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-93198"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536297"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93198"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93198"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93198.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.722Z","epss":0.00206,"epssPercentile":0.10648,"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-835"],"slug":"CVE-2026-93198","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: validate the persisted dirty_tail chain at load\n\nThe writeback worker follows the persisted dirty_tail chain, which is\ndecoded from the cache device independently of the key_tail chain that\ncache_replay() walks and bounds. A crafted image, whose on-media fields are\nauthenticated only by a crc32c with a fixed seed, can aim dirty_tail at a\nchain of last ksets that never terminates, so cache_writeback_fn() re-arms\nitself with no delay forever.\n\nWalk the dirty_tail chain once at load with the same hop cap cache_replay()\nuses and fail the table load with -EIO if it does not reach an end within\nn_segs hops.\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 2026-10-13 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93198.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":220113,"id":"CVE-2026-93198","ts":1791978560602,"field":"cvss","old":null,"new":"5.5"},{"seq":220112,"id":"CVE-2026-93198","ts":1791978560602,"field":"severity","old":"none","new":"medium"}]}