{"id":"CVE-2026-98868","state":"PUBLISHED","title":"dm-pcache: reject a kset that overruns its segment","description":"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 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.","publishedAt":"2026-10-18T15:51:30.658Z","updatedAt":"2026-10-19T09:27:02.926Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"01a700e9278da5706c865b9ca3ae70fdb7b4531d","versionType":"git"},{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10","versionType":"git"},{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-pcache/cache_gc.c","drivers/md/dm-pcache/cache_key.c","drivers/md/dm-pcache/cache_writeback.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-pcache/cache_gc.c","drivers/md/dm-pcache/cache_key.c","drivers/md/dm-pcache/cache_writeback.c"]}],"references":["https://git.kernel.org/stable/c/01a700e9278da5706c865b9ca3ae70fdb7b4531d","https://git.kernel.org/stable/c/96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10","https://git.kernel.org/stable/c/7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98868.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98868","state":"PUBLISHED","datePublished":"2026-10-18T15:51:30.658Z","dateUpdated":"2026-10-19T09:27:02.926Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.377Z"},"containers":{"cna":{"title":"dm-pcache: reject a kset that overruns its segment","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"01a700e9278da5706c865b9ca3ae70fdb7b4531d","versionType":"git"},{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10","versionType":"git"},{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-pcache/cache_gc.c","drivers/md/dm-pcache/cache_key.c","drivers/md/dm-pcache/cache_writeback.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-pcache/cache_gc.c","drivers/md/dm-pcache/cache_key.c","drivers/md/dm-pcache/cache_writeback.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:27:02.926Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}