dm-integrity: replace forgeable discard filler with a keyed sector marker

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Summary

CVECVE-2026-90333
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:31 UTC
Updated2026-09-17 17:17:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm-integrity: replace forgeable discard filler with a keyed sector marker The discard-block check in dm_integrity_rw_tag() treats a stored tag of all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and skips HMAC verification. allow_discards is only accepted in dm-integrity's standalone mode. An attacker with raw write access to the backing device, but without the integrity key, can stamp any block with an all-0xf6 tag and have it served as authentic. Add a new "allow_discards_keyed" target argument that marks discarded blocks with a keyed checksum of (salt || sector) instead, computed by integrity_discard_checksum().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 84597a44a9d86ac949900441cea7da0af0f2f473 5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775 git Not specified
CNA Linux Linux affected 84597a44a9d86ac949900441cea7da0af0f2f473 6228722c27304e4682cddc1fede03898f87e4414 git Not specified
CNA Linux Linux affected 84597a44a9d86ac949900441cea7da0af0f2f473 68c5c42567bc462139128968ebbfadd0aefff519 git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 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/6228722c27304e4682cddc1fede03898f87e4414 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/68c5c42567bc462139128968ebbfadd0aefff519 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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