Bug 2436772 (CVE-2025-71192)

Summary: CVE-2025-71192 kernel: Kernel: Memory corruption via double free in ALSA AC97 controller
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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) AC97 controller. A double free vulnerability exists in the `snd_ac97_controller_register()` function when `ac97_add_adapter()` fails. A local attacker could exploit this flaw, leading to memory corruption and potentially a denial of service or privilege escalation.
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Description OSIDB Bzimport 2026-02-04 17:02:38 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ALSA: ac97: fix a double free in snd_ac97_controller_register()

If ac97_add_adapter() fails, put_device() is the correct way to drop
the device reference. kfree() is not required.
Add kfree() if idr_alloc() fails and in ac97_adapter_release() to do
the cleanup.

Found by code review.
Comment 1 Jon Moroney 2026-02-05 00:30:42 UTC Comment hidden (spam)