Linux Kernel up to 6.6.121/6.12.67/6.18.7/6.19-rc6 ALSA ctamixer.c amixer_index conf initialization

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.6.121/6.12.67/6.18.7/6.19-rc6. Affected is the function amixer_index of the file /build/reproducible-path/linux-6.17.8/sound/pci/ctxfi/ctamixer.c of the component ALSA. Executing a manipulation of the argument conf can lead to initialization. This vulnerability is tracked as CVE-2026-23076. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.6.121/6.12.67/6.18.7/6.19-rc6. This vulnerability affects the function amixer_index of the file /build/reproducible-path/linux-6.17.8/sound/pci/ctxfi/ctamixer.c of the component ALSA. The manipulation of the argument conf with an unknown input leads to a initialization vulnerability. The CWE definition for the vulnerability is CWE-665. The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ALSA: ctxfi: Fix potential OOB access in audio mixer handling In the audio mixer handling code of ctxfi driver, the conf field is used as a kind of loop index, and it's referred in the index callbacks (amixer_index() and sum_index()). As spotted recently by fuzzers, the current code causes OOB access at those functions. | UBSAN: array-index-out-of-bounds in /build/reproducible-path/linux-6.17.8/sound/pci/ctxfi/ctamixer.c:347:48 | index 8 is out of range for type 'unsigned char [8]' After the analysis, the cause was found to be the lack of the proper (re-)initialization of conj field. This patch addresses those OOB accesses by adding the proper initializations of the loop indices.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-23076 since 01/13/2026. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/03/2026).

The vulnerability scanner Nessus provides a plugin with the ID 297889 (Linux Distros Unpatched Vulnerability : CVE-2026-23076), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.122, 6.12.68, 6.18.8 or 6.19-rc7 eliminates this vulnerability. Applying the patch a8c42d11b0526a89192bd2f79facb4c60c8a1f38/d77ba72558cd66704f0fb7e0969f697e87c0f71c/873e2360d247eeee642878fcc3398babff7e387c/61006c540cbdedea83b05577dc7fb7fa18fe1276 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 (297889) and CERT Bund (WID-SEC-2026-0324). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Initialization
CWE: CWE-665
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 297889
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23076

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.122/6.12.68/6.18.8/6.19-rc7
Patch: a8c42d11b0526a89192bd2f79facb4c60c8a1f38/d77ba72558cd66704f0fb7e0969f697e87c0f71c/873e2360d247eeee642878fcc3398babff7e387c/61006c540cbdedea83b05577dc7fb7fa18fe1276

Timelineinfo

01/13/2026 CVE reserved
02/04/2026 +22 days Advisory disclosed
02/04/2026 +0 days VulDB entry created
05/03/2026 +88 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23076 (🔒)
GCVE (CVE): GCVE-0-2026-23076
GCVE (VulDB): GCVE-100-344332
CERT Bund: WID-SEC-2026-0324 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 02/04/2026 18:20
Updated: 05/03/2026 08:24
Changes: 02/04/2026 18:20 (61), 02/06/2026 10:08 (7), 02/07/2026 17:51 (2), 03/18/2026 22:51 (12), 05/03/2026 08:24 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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