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CVE-2022-49879

5.5 · MEDIUM

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.

Published May 1, 2025CWE-617EPSS 0.22%

Overview

CVE-2022-49879 is a medium-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5adRefgit.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340Refgit.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909Refgit.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327Refgit.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3d

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49879?

CVE-2022-49879 is a medium-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49879?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-49879?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-49879?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49879 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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