btrfs: drop recovered reloc root refs on recovery failure
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.109, 6.18.50, 7.2.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: drop recovered reloc root refs on recovery failure During relocation recovery, each fs root gets a reference to its relocation root. If loading or adding a later root fails, or if the first transaction commit fails, btrfs_recover_relocation() jumps to out_unset before merge_reloc_roots() and clean_dirty_subvols(). put_reloc_control() drops the list-owned relocation root references, but it does not clear fs_root->reloc_root or drop the references owned by those pointers. Mount cleanup only drops them when BTRFS_FS_ERROR is set, so an error such as -ENOMEM while processing a later root can leave references behind. Keep temporary references to the fs roots associated during recovery. On failure, clear their reloc_root pointers and drop the corresponding references. Once the first transaction commit succeeds, drop only the temporary fs root references and let the normal merge and cleanup paths handle the relocation roots. Fault injection on a pending-relocation image confirmed the cleanup gap. With an injected first-commit failure, 25 fs roots had reloc_root set with fs_error=0. With this fix, the same failure path drops that count to 0 before mount fails.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From f44deb7442edf42abee6be25fca7e3e86061b4c9 · fixed in 7b8c6af17287899a5d00c70566831feac237d192; From f44deb7442edf42abee6be25fca7e3e86061b4c9 · fixed in 2256d6dc5b88841a8a8b4fd9a9f04730705fb6fd; From f44deb7442edf42abee6be25fca7e3e86061b4c9 · fixed in 8a64baeb5bbb706b83d2235c1e39f5b77183817f; From f44deb7442edf42abee6be25fca7e3e86061b4c9 · fixed in 4d43107e807bcd92621106b07f5011411c6341a8; From f44deb7442edf42abee6be25fca7e3e86061b4c9 · fixed in 6d8ba4572922e336f0b59a80751b018e1e135164
- Linux Linux
5.7
- KernelLinux
From 5.7.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4