Linux Kernel up to 7.0-rc1 UAC3 Section UAC_VERSION_2 out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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3.4$0-$5k0.95

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 7.0-rc1. Affected is the function UAC_VERSION_2 of the component UAC3 Section. The manipulation leads to out-of-bounds. This vulnerability is listed as CVE-2026-23318. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.0-rc1. It has been rated as problematic. This issue affects the function UAC_VERSION_2 of the component UAC3 Section. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-23318 since 01/13/2026. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 303723 (Linux Distros Unpatched Vulnerability : CVE-2026-23318), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7 or 7.0-rc2 eliminates this vulnerability. Applying the patch 0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f/a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc/d3904ca40515272681ae61ad6f561c24f190957f/1e5753ff4c2e86aa88516f97a224c90a3d0b133e/499ffd15b00dc91ac95c28f76959dfb5cdcc84d5/54f9d645a5453d0bfece0c465d34aaf072ea99fa is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (303723) and CERT Bund (WID-SEC-2026-0861). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Open Source Linux Kernel

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 303723
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23318

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.167/6.6.130/6.12.77/6.18.17/6.19.7/7.0-rc2
Patch: 0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f/a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc/d3904ca40515272681ae61ad6f561c24f190957f/1e5753ff4c2e86aa88516f97a224c90a3d0b133e/499ffd15b00dc91ac95c28f76959dfb5cdcc84d5/54f9d645a5453d0bfece0c465d34aaf072ea99fa

Timelineinfo

01/13/2026 CVE reserved
03/25/2026 +71 days Advisory disclosed
03/25/2026 +0 days VulDB entry created
03/30/2026 +5 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23318 (🔒)
GCVE (CVE): GCVE-0-2026-23318
GCVE (VulDB): GCVE-100-353033
CERT Bund: WID-SEC-2026-0861 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/25/2026 12:55
Updated: 03/30/2026 06:30
Changes: 03/25/2026 12:55 (59), 03/26/2026 05:35 (7), 03/26/2026 07:59 (2), 03/30/2026 06:30 (1)
Complete: 🔍
Cache ID: 216:9D8:103

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