What’s Vulnerable › Vulnerabilities

CVE-2026-53369: udf: reject descriptors with oversized CRC length

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-19
• Weakness: CWE-20

Description

In the Linux kernel, the following vulnerability has been resolved: udf: reject descriptors with oversized CRC length udf_read_tagged() skips CRC verification when descCRCLength + sizeof(struct tag) exceeds the block size. A crafted UDF image can set descCRCLength to an oversized value to bypass CRC validation entirely; the descriptor is then accepted based solely on the 8-bit tag checksum, which is trivially recomputable. Reject such descriptors instead of silently accepting them. A legitimate single-block descriptor should never have a CRC length that exceeds the block.

Affected products

• Linux kernel: from 2.6.12.1 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30 — fixed in 5.10.258, 5.15.209, 6.1.175, 6.12.88, 6.18.30, 6.6.140

How to fix

Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 6.1.175, 6.12.88. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1873eb81c65d3f849418d7386baa39c439c9fc38
• https://git.kernel.org/stable/c/31605bbe94557bff721eaf041001169d44ac6f98
• https://git.kernel.org/stable/c/3dede76d525919bb966f9213e131af685de5ff99
• https://git.kernel.org/stable/c/50dfaf4a027742b4fcdc3e9305e7199ece9bc6a6
• https://git.kernel.org/stable/c/55d41b0a20128e86b9e960dd2e3f0a2d69a18df7
• https://git.kernel.org/stable/c/7d1b6adbf90df6c8941090d5646fbeca25ba9770
• https://git.kernel.org/stable/c/832ab4a882dc9b3c0155490d9993642ef545fd22
• https://git.kernel.org/stable/c/fdb26e628d2a211a23815d375bd33bdf863344e2

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