In the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix racy access at PCM trigger The PCM trigger callback of aloop… (CVE-2026-23191)
A use-after-free (UAF) vulnerability was identified and resolved in the ALSA aloop driver in the Linux kernel. The issue arises from racy access in the PCM trigger callback, where state checks and stream stops occur outside the cable lock, potentially causing UAF when streams are triggered frequently. The patch applies locking and null checks to prevent these race conditions. This vulnerability affects multiple Linux kernel versions prior to 6.8.0-1055.56 and related builds. The vulnerability has a high severity with a CVSS score of 7.8. A patch is available and included in updated Linux kernel packages distributed by Ubuntu. Users should update and reboot to apply the fix.
AI Analysis
Technical Summary
CVE-2026-23191 describes a use-after-free vulnerability in the ALSA aloop driver within the Linux kernel. The PCM trigger callback attempts to check the PCM state and stop the tied substream's stream without holding the cable lock, leading to race conditions and potential use-after-free when streams are triggered frequently during open/close operations. The fix involves extending the cable->lock spinlock coverage in loopback_check_format() and adding proper null checks, as well as verifying the state of the capture PCM stream to prevent UAF. This vulnerability affects Linux kernel versions prior to 6.8.0-1055.56 and similar builds. The issue is addressed by official patches distributed by Ubuntu in their kernel updates.
Potential Impact
Successful exploitation of this vulnerability could lead to use-after-free conditions in the ALSA aloop driver, potentially causing system instability or allowing a local attacker to execute arbitrary code with elevated privileges. The CVSS score of 7.8 indicates high severity with impacts on confidentiality, integrity, and availability. However, no known exploits are reported in the wild at this time.
Mitigation Recommendations
An official patch is available and has been incorporated into updated Linux kernel packages for affected Ubuntu releases. Users should apply the kernel updates provided by their distribution and reboot the system to complete remediation. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. No additional mitigations are indicated by the vendor advisory.
In the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix racy access at PCM trigger The PCM trigger callback of aloop… (CVE-2026-23191)
Description
A use-after-free (UAF) vulnerability was identified and resolved in the ALSA aloop driver in the Linux kernel. The issue arises from racy access in the PCM trigger callback, where state checks and stream stops occur outside the cable lock, potentially causing UAF when streams are triggered frequently. The patch applies locking and null checks to prevent these race conditions. This vulnerability affects multiple Linux kernel versions prior to 6.8.0-1055.56 and related builds. The vulnerability has a high severity with a CVSS score of 7.8. A patch is available and included in updated Linux kernel packages distributed by Ubuntu. Users should update and reboot to apply the fix.
CVSS v3.1
Score 7.8high
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
CVE-2026-23191 describes a use-after-free vulnerability in the ALSA aloop driver within the Linux kernel. The PCM trigger callback attempts to check the PCM state and stop the tied substream's stream without holding the cable lock, leading to race conditions and potential use-after-free when streams are triggered frequently during open/close operations. The fix involves extending the cable->lock spinlock coverage in loopback_check_format() and adding proper null checks, as well as verifying the state of the capture PCM stream to prevent UAF. This vulnerability affects Linux kernel versions prior to 6.8.0-1055.56 and similar builds. The issue is addressed by official patches distributed by Ubuntu in their kernel updates.
Potential Impact
Successful exploitation of this vulnerability could lead to use-after-free conditions in the ALSA aloop driver, potentially causing system instability or allowing a local attacker to execute arbitrary code with elevated privileges. The CVSS score of 7.8 indicates high severity with impacts on confidentiality, integrity, and availability. However, no known exploits are reported in the wild at this time.
Mitigation Recommendations
An official patch is available and has been incorporated into updated Linux kernel packages for affected Ubuntu releases. Users should apply the kernel updates provided by their distribution and reboot the system to complete remediation. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. No additional mitigations are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23191
- 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
- 4.0
Threat ID: 6a5b63062d1edb114c8a8395
Added to database: 07/18/2026, 11:27:02 UTC
Last enriched: 08/01/2026, 07:15:56 UTC
Last updated: 09/14/2026, 22:01:32 UTC
Views: 12
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