Bug 2467225 (CVE-2026-43126)

Summary: CVE-2026-43126 kernel: ALSA: mixer: oss: Add card disconnect checkpoints
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Advanced Linux Sound Architecture (ALSA) Open Sound System (OSS) mixer component. This vulnerability arises when pending calls to kernel control operations are not properly handled during device disconnection, leading to potential Use-After-Free (UAF) scenarios. A local attacker could potentially exploit this to cause a denial of service or achieve arbitrary code execution.
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Description OSIDB Bzimport 2026-05-06 13:11:49 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ALSA: mixer: oss: Add card disconnect checkpoints

ALSA OSS mixer layer calls the kcontrol ops rather individually, and
pending calls might be not always caught at disconnecting the device.

For avoiding the potential UAF scenarios, add sanity checks of the
card disconnection at each entry point of OSS mixer accesses.  The
rwsem is taken just before that check, hence the rest context should
be covered by that properly.
Comment 1 Keith Grant 2026-05-06 17:44:03 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050619-CVE-2026-43126-5b1d@gregkh/T