In the Linux kernel, the following vulnerability has been resolved: ALSA: ctxfi: Fix potential OOB access in audio mixer handling In the audio mixer… (CVE-2026-23076)
A vulnerability in the Linux kernel's ALSA ctxfi audio mixer handling was fixed to address a potential out-of-bounds (OOB) access caused by improper initialization of loop indices. This flaw could lead to memory corruption and denial of service. The issue was identified by fuzzing tools and corrected by adding proper initialization in the affected code. The vulnerability has a CVSS score of 7.1, indicating a medium severity level. Multiple Linux kernel versions prior to specific 5.15.x releases are affected. Official patches are available and distributed through Ubuntu security updates, requiring system updates and reboots to apply. Users should update to the fixed kernel versions to mitigate this issue.
AI Analysis
Technical Summary
The Linux kernel ALSA ctxfi driver had a vulnerability involving potential out-of-bounds array access in audio mixer handling functions (amixer_index() and sum_index()) due to improper initialization of the 'conf' field used as a loop index. This flaw was detected by UBSAN and fuzzers, showing an array index out of bounds at index 8 for an array of size 8. The issue was resolved by adding proper initialization of the loop indices in the kernel source code. The vulnerability affects multiple Linux kernel 5.15.x versions prior to certain patch releases. Ubuntu has released security advisories (USN-8162-1, USN-8180-1) providing updated kernel packages that fix this and other vulnerabilities. The fix requires rebooting the system and recompiling third-party kernel modules due to ABI changes.
Potential Impact
This vulnerability allows local attackers with limited privileges to cause out-of-bounds memory access in the kernel, potentially leading to denial of service (system crash) or other memory corruption impacts. The CVSS 3.1 score of 7.1 reflects high confidentiality impact and high availability impact but no integrity impact. There are no known exploits in the wild. The flaw affects the ALSA ctxfi audio mixer driver subsystem in affected Linux kernel versions.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages for affected versions. Users should apply the official security updates provided by their Linux distribution, specifically upgrading to the fixed kernel versions listed in the Ubuntu advisories USN-8162-1 and USN-8180-1. After updating, a system reboot is required to apply the fixes. Due to ABI changes, third-party kernel modules must be recompiled and reinstalled. No additional mitigation steps are required beyond applying the official patches and rebooting.
In the Linux kernel, the following vulnerability has been resolved: ALSA: ctxfi: Fix potential OOB access in audio mixer handling In the audio mixer… (CVE-2026-23076)
Description
A vulnerability in the Linux kernel's ALSA ctxfi audio mixer handling was fixed to address a potential out-of-bounds (OOB) access caused by improper initialization of loop indices. This flaw could lead to memory corruption and denial of service. The issue was identified by fuzzing tools and corrected by adding proper initialization in the affected code. The vulnerability has a CVSS score of 7.1, indicating a medium severity level. Multiple Linux kernel versions prior to specific 5.15.x releases are affected. Official patches are available and distributed through Ubuntu security updates, requiring system updates and reboots to apply. Users should update to the fixed kernel versions to mitigate this issue.
CVSS v3.1
Score 7.1high
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel ALSA ctxfi driver had a vulnerability involving potential out-of-bounds array access in audio mixer handling functions (amixer_index() and sum_index()) due to improper initialization of the 'conf' field used as a loop index. This flaw was detected by UBSAN and fuzzers, showing an array index out of bounds at index 8 for an array of size 8. The issue was resolved by adding proper initialization of the loop indices in the kernel source code. The vulnerability affects multiple Linux kernel 5.15.x versions prior to certain patch releases. Ubuntu has released security advisories (USN-8162-1, USN-8180-1) providing updated kernel packages that fix this and other vulnerabilities. The fix requires rebooting the system and recompiling third-party kernel modules due to ABI changes.
Potential Impact
This vulnerability allows local attackers with limited privileges to cause out-of-bounds memory access in the kernel, potentially leading to denial of service (system crash) or other memory corruption impacts. The CVSS 3.1 score of 7.1 reflects high confidentiality impact and high availability impact but no integrity impact. There are no known exploits in the wild. The flaw affects the ALSA ctxfi audio mixer driver subsystem in affected Linux kernel versions.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages for affected versions. Users should apply the official security updates provided by their Linux distribution, specifically upgrading to the fixed kernel versions listed in the Ubuntu advisories USN-8162-1 and USN-8180-1. After updating, a system reboot is required to apply the fixes. Due to ABI changes, third-party kernel modules must be recompiled and reinstalled. No additional mitigation steps are required beyond applying the official patches and rebooting.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23076
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 3.1
Threat ID: 6a5b634a2d1edb114c8b114e
Added to database: 07/18/2026, 11:28:10 UTC
Last enriched: 08/22/2026, 21:27:00 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 8
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