btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68442
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 00:17:44 UTC
Updated2026-08-12 00:17:44 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: btrfs: don't propagate EXTENT_FLAG_LOGGING to split extent maps When btrfs_drop_extent_map_range() splits an extent map, the new split maps inherit the original map's flags through a local 'flags' variable. Commit f86f7a75e2fb ("btrfs: use the flags of an extent map to identify the compression type") changed the EXTENT_FLAG_LOGGING clearing to operate on em->flags instead of that local 'flags' copy, so a split of an extent map that is currently being logged wrongly inherits EXTENT_FLAG_LOGGING. The flag is then never cleared on the split, and when it is freed while still on the inode's modified_extents list (for example by the extent map shrinker) it trips the WARN_ON(!list_empty(&em->list)) in btrfs_free_extent_map() and leads to a use-after-free. Clear EXTENT_FLAG_LOGGING from the local 'flags' copy used for the splits and only clear EXTENT_FLAG_PINNED from em->flags, restoring the behaviour prior to f86f7a75e2fb.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 2a9246a424f45f33a1b8367052611ebe874868ad git Not specified
CNA Linux Linux affected f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 9304713b70e7e1450e3a76e758836fe5391bfa95 git Not specified
CNA Linux Linux affected f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 0e465c63f103a5ce6849614d6bda048d70eebec8 git Not specified
CNA Linux Linux affected f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 5eff4d5b17fa1950e80bfd1ba43dc0699e61a644 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5eff4d5b17fa1950e80bfd1ba43dc0699e61a644 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2a9246a424f45f33a1b8367052611ebe874868ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9304713b70e7e1450e3a76e758836fe5391bfa95 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0e465c63f103a5ce6849614d6bda048d70eebec8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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