dm-era: fix shadowed superblock leak on take-snap failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89576
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:41 UTC
Updated2026-09-11 20:19:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm-era: fix shadowed superblock leak on take-snap failure metadata_take_snap() bumps the live superblock refcount and then dm_tm_shadow_block() allocates a new block for the metadata snapshot. If the subsequent dm_sm_inc_block() of writeset_tree_root or era_array_root fails, the function only unlocks the clone and returns. The newly allocated shadow block is never returned to the metadata space map, so each failed take-snap permanently leaks one metadata block. Free the clone with dm_sm_dec_block() on those error paths, matching the final step of metadata_drop_snap().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected eec40579d84873dfb7021eb24c50360f073237c5 d66ceeefb87ddb097b0546bafc581380b816b048 git Not specified
CNA Linux Linux affected eec40579d84873dfb7021eb24c50360f073237c5 36ff918637e3517f732188a3c39dbeae5b9cfb1b git Not specified
CNA Linux Linux affected eec40579d84873dfb7021eb24c50360f073237c5 6876ca330e741fb8886d12070cb6a7f9cb67257e git Not specified
CNA Linux Linux affected eec40579d84873dfb7021eb24c50360f073237c5 39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713 git Not specified
CNA Linux Linux affected 3.15 Not specified
CNA Linux Linux unaffected 3.15 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 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/d66ceeefb87ddb097b0546bafc581380b816b048 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6876ca330e741fb8886d12070cb6a7f9cb67257e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/36ff918637e3517f732188a3c39dbeae5b9cfb1b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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