CVE-2026-43126
Undergoing Analysis Undergoing Analysis - In Progress
Linux Kernel ALSA OSS Mixer Use-After-Free Fix

Publication date: 2026-05-06

Last updated on: 2026-05-08

Assigner: kernel.org

Description
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.
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Meta Information
Published
2026-05-06
Last Modified
2026-05-08
Generated
2026-06-16
AI Q&A
2026-05-06
EPSS Evaluated
2026-06-14
NVD
CVE-2026-43126
EUVD
EUVD-2026-27687
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.13 (inc) to 6.18.16 (exc)
linux linux_kernel From 6.19 (inc) to 6.19.6 (exc)
linux linux_kernel From 2.6.12 (inc) to 6.12.75 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's ALSA OSS mixer layer. The issue arises because the mixer layer calls the kcontrol operations individually, and some pending calls might not be properly handled when the device is disconnecting. This can lead to use-after-free (UAF) scenarios. To fix this, sanity checks for card disconnection were added at each entry point of OSS mixer accesses, with a read-write semaphore (rwsem) taken before the check to ensure proper context coverage.

Impact Analysis

The vulnerability could lead to use-after-free conditions in the ALSA OSS mixer layer when a device is disconnected. This might cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or cause denial of service by exploiting the improper handling of device disconnection.

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