CVE-2024-26590: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: erofs: fix inconsistent per-file compression format EROFS can select compression algorithms on a per-file basis, and each per-file compression algorithm needs to be marked in the on-disk superblock for initialization. However, syzkaller can generate inconsistent crafted images that use an unsupported algorithmtype for specific inodes, e.g. use MicroLZMA algorithmtype even it's not set in `sbi->available_compr_algs`. This can lead to an unexpected "BUG: kernel NULL pointer dereference" if the corresponding decompressor isn't built-in. Fix this by checking against `sbi->available_compr_algs` for each m_algorithmformat request. Incorrect !erofs_sb_has_compr_cfgs preset bitmap is now fixed together since it was harmless previously.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.16.0 — 6.6.14
linux	linux_kernel	6.7.0 — 6.7.2

References

Advisories & Patches

https://git.kernel.org/stable/c/118a8cf504d7dfa519562d000f423ee3ca75d2c4 https://git.kernel.org/stable/c/47467e04816cb297905c0f09bc2d11ef865942d9 https://git.kernel.org/stable/c/823ba1d2106019ddf195287ba53057aee33cf724 https://git.kernel.org/stable/c/eed24b816e50c6cd18cbee0ff0d7218c8fced199 https://git.kernel.org/stable/c/118a8cf504d7dfa519562d000f423ee3ca75d2c4 https://git.kernel.org/stable/c/47467e04816cb297905c0f09bc2d11ef865942d9 https://git.kernel.org/stable/c/823ba1d2106019ddf195287ba53057aee33cf724 https://git.kernel.org/stable/c/eed24b816e50c6cd18cbee0ff0d7218c8fced199

Frequently Asked Questions

What is CVE-2024-26590? +

In the Linux kernel, the following vulnerability has been resolved: erofs: fix inconsistent per-file compression format EROFS can select compression algorithms on a per-file basis, and each per-file compression algorithm needs to be marked in the on-disk superblock for initialization. However, syzkaller can generate inconsistent crafted images that use an unsupported algorithmtype for specific inodes, e.g. use MicroLZMA algorithmtype even it's not set in `sbi->available_compr_algs`. This can lead to an unexpected "BUG: kernel NULL pointer dereference" if the corresponding decompressor isn't built-in. Fix this by checking against `sbi->available_compr_algs` for each m_algorithmformat request. Incorrect !erofs_sb_has_compr_cfgs preset bitmap is now fixed together since it was harmless previously. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-26590? +

CVE-2024-26590 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-26590? +

CVE-2024-26590 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-26590? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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