CVE-2026-46157
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Race Condition in Linux Kernel ALSA PCM OSS Subsystem

Publication date: 2026-05-28

Last updated on: 2026-06-09

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger Currently the runtime.oss.trigger field may be accessed concurrently without protection, which may lead to the data race. And, in this case, it may lead to more severe problem because it's a bit field; as writing the data, it may overwrite other bit fields as well, which confuses the operation completely, as spotted by fuzzing. Fix it by covering runtime.oss.trigger bit fled also with the existing params_lock mutex in both snd_pcm_oss_get_trigger() and snd_pcm_oss_poll().
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Meta Information
Published
2026-05-28
Last Modified
2026-06-09
Generated
2026-06-17
AI Q&A
2026-05-28
EPSS Evaluated
2026-06-16
NVD
CVE-2026-46157
EUVD
EUVD-2026-32784
Affected Vendors & Products
Showing 9 associated CPEs
Vendor Product Version / Range
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 7.1
linux linux_kernel From 2.6.12.1 (inc) to 6.12.88 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.30 (exc)
linux linux_kernel From 6.19 (inc) to 7.0.7 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
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Mitigation Strategies

To mitigate this vulnerability, update your Linux kernel to a version where the ALSA pcm oss component has been fixed to protect the runtime.oss.trigger field with the existing params_lock mutex. This prevents the data race condition.

Since the issue is a data race in the kernel ALSA subsystem, applying the official patch or upgrading to a kernel version released after 2026-05-28 that includes this fix is the recommended immediate step.

Executive Summary

This vulnerability exists in the Linux kernel's ALSA pcm oss component. It involves a data race condition when accessing the runtime.oss.trigger field. Because this field is a bit field, concurrent access without proper synchronization can cause overwriting of other bits, leading to incorrect operation. The issue was identified through fuzzing and fixed by protecting the runtime.oss.trigger field with an existing mutex lock.

Impact Analysis

The data race in accessing the runtime.oss.trigger bit field can cause unpredictable behavior in the ALSA pcm oss component of the Linux kernel. This may lead to corrupted data or malfunctioning audio operations, potentially causing system instability or unexpected behavior in applications relying on this audio subsystem.

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