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Vulnerability record · CVE-2026-23318 · published 25 March 2026

CVE-2026-23318: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Use correct version for UAC3 header validation The entry of the validators table for UAC3 AC header descriptor is defined with the wrong protocol version UAC_VERSION_2, while it should have been UAC_VERSION_3. This results in the validator never matching for actual UAC3 devices (protocol == UAC_VERSION_3), causing their header descriptors to bypass validation entirely. A malicious USB device presenting a truncated UAC3 header could exploit this to cause out-of-bounds reads when the driver later accesses unvalidated descriptor fields. The bug was introduced in the same commit as the recently fixed UAC3 feature unit sub-type typo, and appears to be from the same copy-paste error when the UAC3 section was created from the UAC2 section.

7.1 CVSS 3.1 High EPSS 0.13% · top 97.7% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Use correct version for UAC3 header validation The entry of the validators table for UAC3 AC header descriptor is defined with the wrong protocol version UAC_VERSION_2, while it should have been UAC_VERSION_3. This results in the validator never matching for actual UAC3 devices (protocol == UAC_VERSION_3), causing their header descriptors to bypass validation entirely. A malicious USB device presenting a truncated UAC3 header could exploit this to cause out-of-bounds reads when the driver later accesses unvalidated descriptor fields. The bug was introduced in the same commit as the recently fixed UAC3 feature unit sub-type typo, and appears to be from the same copy-paste error when the UAC3 section was created from the UAC2 section.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f Patch
https://git.kernel.org/stable/c/1e5753ff4c2e86aa88516f97a224c90a3d0b133e Patch
https://git.kernel.org/stable/c/499ffd15b00dc91ac95c28f76959dfb5cdcc84d5 Patch
https://git.kernel.org/stable/c/54f9d645a5453d0bfece0c465d34aaf072ea99fa Patch
https://git.kernel.org/stable/c/82a7d0a1b88798de1a609130080ce0c65dd869e9 Patch
https://git.kernel.org/stable/c/8307d93e63d5f54ef10412d4db2dd551e920dee4 Patch
https://git.kernel.org/stable/c/a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc Patch
https://git.kernel.org/stable/c/d3904ca40515272681ae61ad6f561c24f190957f Patch

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Source: NIST National Vulnerability Database (record CVE-2026-23318), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.