CVE-2022-49879
ext4: fix BUG_ON() when directory entry has invalid rec_len
In the Linux kernel, the following vulnerability has been resolved: ext4: fix BUG_ON() when directory entry has invalid rec_len The rec_len field in the directory entry has to be a multiple of 4. A corrupted filesystem image can be used to hit a BUG() in ext4_rec_len_to_disk(), called from make_indexed_dir(). ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4.h:2413! ... RIP: 0010:make_indexed_dir+0x53f/0x5f0 ... Call Trace: <TASK> ? add_dirent_to_buf+0x1b2/0x200 ext4_add_entry+0x36e/0x480 ext4_add_nondir+0x2b/0xc0 ext4_create+0x163/0x200 path_openat+0x635/0xe90 do_filp_open+0xb4/0x160 ? __create_object.isra.0+0x1de/0x3b0 ? _raw_spin_unlock+0x12/0x30 do_sys_openat2+0x91/0x150 __x64_sys_open+0x6c/0xa0 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The fix simply adds a call to ext4_check_dir_entry() to validate the directory entry, returning -EFSCORRUPTED if the entry is invalid.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4; < 2fa24d0274fbf913b56ee31f15bc01168669d909 (affected, git) ≥ 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4; < 156451a67b93986fb07c274ef6995ff40766c5ad (affected, git) ≥ 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4; < 999cff2b6ce3b45c08abf793bf55534777421327 (affected, git) ≥ 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4; < ce1ee2c8827fb6493e91acbd50f664cf2a972c3d (affected, git) ≥ 3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4; < 17a0bc9bd697f75cfdf9b378d5eb2d7409c91340 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
2.6.30 (affected) ≥ 0; < 2.6.30 (unaffected, semver) ≥ 5.4.224; ≤ 5.4.* (unaffected, semver) ≥ 5.10.154; ≤ 5.10.* (unaffected, semver) ≥ 5.15.78; ≤ 5.15.* (unaffected, semver) ≥ 6.0.8; ≤ 6.0.* (unaffected, semver) ≥ 6.1; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909CNA: Linux
- https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5adCNA: Linux
- https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327CNA: Linux
- https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3dCNA: Linux
- https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340CNA: Linux
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