{"id":"CVE-2026-98868","title":"dm-pcache: reject a kset that overruns its segment","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: reject a kset that overruns its segment\n\ncache_replay(), the writeback worker and the GC worker read a kset of\nget_kset_onmedia_size() bytes and advance the …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 01a700e9278da5706c865b9ca3ae70fdb7b4531d","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10","Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb","Linux 6.18"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:51:30.658Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98868","references":[{"url":"https://git.kernel.org/stable/c/01a700e9278da5706c865b9ca3ae70fdb7b4531d"},{"url":"https://git.kernel.org/stable/c/96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10"},{"url":"https://git.kernel.org/stable/c/7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.457Z","slug":"CVE-2026-98868","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: reject a kset that overruns its segment\n\ncache_replay(), the writeback worker and the GC worker read a kset of\nget_kset_onmedia_size() bytes and advance the position by it. A forged\nkey_num makes that size exceed the segment's remaining space, so the\nadvance walks past the segment and trips the cache_pos_advance() BUG_ON.\n\nReject a kset whose on-media size exceeds cache_seg_remain() before use.\n\n## Affected\n\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 01a700e9278da5706c865b9ca3ae70fdb7b4531d`\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10`\n- `Linux >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 < 7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb`\n- `Linux 6.18`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}