Description (CNA)
In 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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 before 2a9246a424f45f33a1b8367052611ebe874868ad; affected f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 before 9304713b70e7e1450e3a76e758836fe5391bfa95; affected f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 before 0e465c63f103a5ce6849614d6bda048d70eebec8; affected f86f7a75e2fb5fd7d31d00eab8a392f97ba42ce9 before 5eff4d5b17fa1950e80bfd1ba43dc0699e61a644 |
| Linux / Linux | affected 6.8; unaffected 0 before 6.8; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/2a9246a424f45f33a1b8367052611ebe874868ad
- https://git.kernel.org/stable/c/9304713b70e7e1450e3a76e758836fe5391bfa95
- https://git.kernel.org/stable/c/0e465c63f103a5ce6849614d6bda048d70eebec8
- https://git.kernel.org/stable/c/5eff4d5b17fa1950e80bfd1ba43dc0699e61a644
ADP enrichment
No English description supplied.
No references supplied.