CVE-2022-49348
ext4: filter out EXT4_FC_REPLAY from on-disk superblock field s_state
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: filter out EXT4_FC_REPLAY from on-disk superblock field s_state The EXT4_FC_REPLAY bit in sbi->s_mount_state is used to indicate that we are in the middle of replay the fast commit journal. This was actually a mistake, since the sbi->s_mount_info is initialized from es->s_state. Arguably s_mount_state is misleadingly named, but the name is historical --- s_mount_state and s_state dates back to ext2. What should have been used is the ext4_{set,clear,test}_mount_flag() inline functions, which sets EXT4_MF_* bits in sbi->s_mount_flags. The problem with using EXT4_FC_REPLAY is that a maliciously corrupted superblock could result in EXT4_FC_REPLAY getting set in s_mount_state. This bypasses some sanity checks, and this can trigger a BUG() in ext4_es_cache_extent(). As a easy-to-backport-fix, filter out the EXT4_FC_REPLAY bit for now. We should eventually transition away from EXT4_FC_REPLAY to something like EXT4_MF_REPLAY.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.29% · top 79% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 – < cc5b09cb6dacd4b32640537929ab4ee8fb2b9e04
- affected 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 – < b99fd73418350dea360da8311e87a6a7b0e15a4c
- affected 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 – < af2f1932743fb52ebcb008ad7ac500d9df0aa796
- affected 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 – < 55b4dbb29054a05d839562f6d635ce05669b016d
- affected 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 – < c878bea3c9d724ddfa05a813f30de3d25a0ba83f
- affected 5.10
- unaffected < 5.10
- unaffected 5.10.121 – ≤ 5.10.*
- unaffected 5.15.46 – ≤ 5.15.*
- unaffected 5.17.14 – ≤ 5.17.*
- unaffected 5.18.3 – ≤ 5.18.*
- unaffected 5.19 – ≤ *
References (5)
- https://git.kernel.org/stable/c/cc5b09cb6dacd4b32640537929ab4ee8fb2b9e04 (opens in a new tab)
- https://git.kernel.org/stable/c/b99fd73418350dea360da8311e87a6a7b0e15a4c (opens in a new tab)
- https://git.kernel.org/stable/c/af2f1932743fb52ebcb008ad7ac500d9df0aa796 (opens in a new tab)
- https://git.kernel.org/stable/c/55b4dbb29054a05d839562f6d635ce05669b016d (opens in a new tab)
- https://git.kernel.org/stable/c/c878bea3c9d724ddfa05a813f30de3d25a0ba83f (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2022-49348)Record last updated .