CVE-2026-46157: ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-28 · updated 2026-10-30
Weakness: CWE-362

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().

Affected products

Linux kernel: from 2.6.12.1 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 2.6.12-rc2, 2.6.12-rc3, 2.6.12-rc4, 2.6.12-rc5, 7.1-rc1; 2.6.12 — fixed in 6.12.88, 6.18.30, 7.0.7
Linux: 2.6.12 — fixed in 7.1

How to fix

Upgrade to a fixed version: Linux kernel 6.12.88, 6.18.30, 7.0.7; Linux 7.1. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-46157 or the next vulnerability affects your stack