# CVE-2022-49879: linux: In the Linux kernel, the following vulnerability has been resolved:  ext4: fix BUG_ON() when directory entry has inva...

CVE-2022-49879 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49879, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49879
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.8-1 | [DEBIAN-CVE-2022-49879](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49879.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.8-1 | [DEBIAN-CVE-2022-49879](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49879.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.8-1 | [DEBIAN-CVE-2022-49879](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49879.md) | May 1, 2025 |

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