CVE-2026-53369

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.

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EPSS — Exploit Prediction

0.0019

Probability of exploitation

0.08%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other 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

Frequently Asked Questions

What is CVE-2026-53369? +

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.

How do I check if I'm vulnerable to CVE-2026-53369? +

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.