What’s Vulnerable › Vulnerabilities

CVE-2022-49288: ALSA: pcm: Fix races among concurrent prealloc proc writes

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: Fix races among concurrent prealloc proc writes We have no protection against concurrent PCM buffer preallocation changes via proc files, and it may potentially lead to UAF or some weird problem. This patch applies the PCM open_mutex to the proc write operation for avoiding the racy proc writes and the PCM stream open (and further operations).

Affected products

• Linux kernel: before 4.14.279; from 4.15 before 4.19.243; from 4.20 before 5.4.193; from 5.5 before 5.10.109; from 5.11 before 5.15.32; from 5.16 before 5.16.18 — fixed in 4.14.279, 4.19.243, 5.10.109, 5.15.32, 5.16.18, 5.17.1

How to fix

Upgrade to a fixed version: Linux kernel 4.14.279, 4.19.243, 5.10.109, 5.15.32. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/37b12c16beb6f6c1c3c678c1aacbc46525c250f7
• https://git.kernel.org/stable/c/51fce708ab8986a9879ee5da946a2cc120f1036d
• https://git.kernel.org/stable/c/5ed8f8e3c4e59d0396b9ccf2e639711e24295bb6
• https://git.kernel.org/stable/c/69534c48ba8ce552ce383b3dfdb271ffe51820c3
• https://git.kernel.org/stable/c/a21d2f323b5a978dedf9ff1d50f101f85e39b3f2
• https://git.kernel.org/stable/c/b560d670c87d7d40b3cf6949246fa4c7aa65a00a
• https://git.kernel.org/stable/c/e14dca613e0a6ddc2bf6e360f16936a9f865205b
• https://git.kernel.org/stable/c/e7786c445bb67a9a6e64f66ebd6b7215b153ff7d

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