{"api_version":"1","generated_at":"2026-09-20T17:39:15+00:00","cve":"CVE-2026-93198","urls":{"html":"https://cve.report/CVE-2026-93198","api":"https://cve.report/api/cve/CVE-2026-93198.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93198","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93198"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:18:16","updated_at":"2026-09-17 17:18:16"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b","name":"https://git.kernel.org/stable/c/58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8195cf3f4a82ef49d9b0651c507ed0784caf23fb","name":"https://git.kernel.org/stable/c/8195cf3f4a82ef49d9b0651c507ed0784caf23fb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4822a030929e0e77aa380722dc42e3e4c9edd346","name":"https://git.kernel.org/stable/c/4822a030929e0e77aa380722dc42e3e4c9edd346","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93198","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93198","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 8195cf3f4a82ef49d9b0651c507ed0784caf23fb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 4822a030929e0e77aa380722dc42e3e4c9edd346 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"93198","cve":"CVE-2026-93198","epss":"0.001840000","percentile":"0.082900000","score_date":"2026-09-19","updated_at":"2026-09-20 00:14:31"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/md/dm-pcache/cache.c","drivers/md/dm-pcache/cache.h","drivers/md/dm-pcache/cache_key.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"8195cf3f4a82ef49d9b0651c507ed0784caf23fb","status":"affected","version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","versionType":"git"},{"lessThan":"4822a030929e0e77aa380722dc42e3e4c9edd346","status":"affected","version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","versionType":"git"},{"lessThan":"58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b","status":"affected","version":"1d57628ff95b32d5cfa8d8f50e07690c161e9cf0","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/md/dm-pcache/cache.c","drivers/md/dm-pcache/cache.h","drivers/md/dm-pcache/cache_key.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.18"},{"lessThan":"6.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:12:20.439Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"dm-pcache: validate the persisted dirty_tail chain at load","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93198","datePublished":"2026-09-17T16:12:20.439Z","dateReserved":"2026-09-17T16:02:15.092Z","dateUpdated":"2026-09-17T16:12:20.439Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:18:16","lastModifiedDate":"2026-09-17 17:18:16","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93198","Ordinal":"1","Title":"dm-pcache: validate the persisted dirty_tail chain at load","CVE":"CVE-2026-93198","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93198","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"dm-pcache: validate the persisted dirty_tail chain at load"}]}}}