dm-pcache: validate the persisted dirty_tail chain at load

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Summary

CVECVE-2026-93198
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:16 UTC
Updated2026-09-17 17:18:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm-pcache: validate the persisted dirty_tail chain at load The writeback worker follows the persisted dirty_tail chain, which is decoded from the cache device independently of the key_tail chain that cache_replay() walks and bounds. A crafted image, whose on-media fields are authenticated only by a crc32c with a fixed seed, can aim dirty_tail at a chain of last ksets that never terminates, so cache_writeback_fn() re-arms itself with no delay forever. Walk the dirty_tail chain once at load with the same hop cap cache_replay() uses and fail the table load with -EIO if it does not reach an end within n_segs hops.

Risk And Classification

EPSS: 0.001840000 probability, percentile 0.082900000 (date 2026-09-19)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 8195cf3f4a82ef49d9b0651c507ed0784caf23fb git Not specified
CNA Linux Linux affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 4822a030929e0e77aa380722dc42e3e4c9edd346 git Not specified
CNA Linux Linux affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8195cf3f4a82ef49d9b0651c507ed0784caf23fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4822a030929e0e77aa380722dc42e3e4c9edd346 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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