{"id":"CVE-2026-93198","state":"PUBLISHED","title":"dm-pcache: validate the persisted dirty_tail chain at load","description":"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 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.","publishedAt":"2026-09-17T16:12:20.439Z","updatedAt":"2026-10-19T09:07:10.545Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"8195cf3f4a82ef49d9b0651c507ed0784caf23fb","versionType":"git"},{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"4822a030929e0e77aa380722dc42e3e4c9edd346","versionType":"git"},{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-pcache/cache.c","drivers/md/dm-pcache/cache.h","drivers/md/dm-pcache/cache_key.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":"7.2.6","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.c","drivers/md/dm-pcache/cache.h","drivers/md/dm-pcache/cache_key.c"]}],"references":["https://git.kernel.org/stable/c/8195cf3f4a82ef49d9b0651c507ed0784caf23fb","https://git.kernel.org/stable/c/4822a030929e0e77aa380722dc42e3e4c9edd346","https://git.kernel.org/stable/c/58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93198.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93198","state":"PUBLISHED","datePublished":"2026-09-17T16:12:20.439Z","dateUpdated":"2026-10-19T09:07:10.545Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T16:02:15.092Z"},"containers":{"cna":{"title":"dm-pcache: validate the persisted dirty_tail chain at load","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"8195cf3f4a82ef49d9b0651c507ed0784caf23fb","versionType":"git"},{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"4822a030929e0e77aa380722dc42e3e4c9edd346","versionType":"git"},{"version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","status":"affected","lessThan":"58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-pcache/cache.c","drivers/md/dm-pcache/cache.h","drivers/md/dm-pcache/cache_key.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":"7.2.6","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.c","drivers/md/dm-pcache/cache.h","drivers/md/dm-pcache/cache_key.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8195cf3f4a82ef49d9b0651c507ed0784caf23fb"},{"url":"https://git.kernel.org/stable/c/4822a030929e0e77aa380722dc42e3e4c9edd346"},{"url":"https://git.kernel.org/stable/c/58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:07:10.545Z"},"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":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}