CyberSecBulletin
CVE-2026-53369NVD status: Modified

In the Linux kernel, the following vulnerability has been resolved: udf: reject descriptors…

Published Updated By the CyberSecBulletin desk

CVE-2026-53369 is a high-severity improper input validation vulnerability in Linux, with a CVSS 3.1 base score of 8.4 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, without any action from a user. The record lists versions 832ab4a882dc9b3c0155490d9993642ef545fd22, 7d1b6adbf90df6c8941090d5646fbeca25ba9770, 3dede76d525919bb966f9213e131af685de5ff99 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.19% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 832ab4a882dc9b3c0155490d9993642ef545fd22 or 7d1b6adbf90df6c8941090d5646fbeca25ba9770 or 3dede76d525919bb966f9213e131af685de5ff99 or 50dfaf4a027742b4fcdc3e9305e7199ece9bc6a6, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.258 or 5.15.209 or 6.1.175 or 6.6.140, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 832ab4a882dc9b3c0155490d9993642ef545fd22; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 7d1b6adbf90df6c8941090d5646fbeca25ba9770; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 3dede76d525919bb966f9213e131af685de5ff99; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 50dfaf4a027742b4fcdc3e9305e7199ece9bc6a6; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 31605bbe94557bff721eaf041001169d44ac6f98; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 1873eb81c65d3f849418d7386baa39c439c9fc38; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, fdb26e628d2a211a23815d375bd33bdf863344e2; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 55d41b0a20128e86b9e960dd2e3f0a2d69a18df7; and 1 more ranges832ab4a882dc9b3c0155490d9993642ef545fd22, 7d1b6adbf90df6c8941090d5646fbeca25ba9770, 3dede76d525919bb966f9213e131af685de5ff99, 50dfaf4a027742b4fcdc3e9305e7199ece9bc6a6, 31605bbe94557bff721eaf041001169d44ac6f98, 1873eb81c65d3f849418d7386baa39c439c9fc38
LinuxLinux Kernel2.6.12.1 up to, but not including, 5.10.258; 5.11 up to, but not including, 5.15.209; 5.16 up to, but not including, 6.1.175; 6.2 up to, but not including, 6.6.140; 6.7 up to, but not including, 6.12.88; 6.13 up to, but not including, 6.18.30; 6.19 up to, but not including, 7.0.7; 2.6.12; and 1 more ranges5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, 6.18.30

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA.

Official 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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How developers prevent this class of flaw

  • Consider using language-theoretic security (LangSec) techniques that characterize inputs using a formal language and build recognizers for that language. This effectively requires parsing to be a distinct layer that effectively enforces a boundary between raw input and internal data representations, instead of allowing parser code to be scattered throughout the program, where it could be subject to errors or inconsistencies that create weaknesses.
  • Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
  • Understand all the potential areas where untrusted inputs can enter the product, including but not limited to: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.

More Improper Input Validation vulnerabilities (CWE-20)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Improper Input Validation vulnerabilities

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