dm-pcache: reject a kset that overruns its segment

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Summary

CVECVE-2026-98868
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:41 UTC
Updated2026-10-19 10:19:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm-pcache: reject a kset that overruns its segment cache_replay(), the writeback worker and the GC worker read a kset of get_kset_onmedia_size() bytes and advance the position by it. A forged key_num makes that size exceed the segment's remaining space, so the advance walks past the segment and trips the cache_pos_advance() BUG_ON. Reject a kset whose on-media size exceeds cache_seg_remain() before use.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 01a700e9278da5706c865b9ca3ae70fdb7b4531d git Not specified
CNA Linux Linux affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10 git Not specified
CNA Linux Linux affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb 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 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/01a700e9278da5706c865b9ca3ae70fdb7b4531d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/96e2863b1f81ea61b8d8d5d5a45d3b4c018f8e10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7ac1f10f987a2ffae4aecf0e2ceca8f552b665cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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