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CVE-2024-57893: ALSA: seq: oss: Fix races at processing SysEx messages

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-15 · updated 2026-08-04
• Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: oss: Fix races at processing SysEx messages OSS sequencer handles the SysEx messages split in 6 bytes packets, and ALSA sequencer OSS layer tries to combine those. It stores the data in the internal buffer and this access is racy as of now, which may lead to the out-of-bounds access. As a temporary band-aid fix, introduce a mutex for serializing the process of the SysEx message packets.

Affected products

• Linux kernel: before 6.1.124; from 6.2 before 6.6.70; from 6.7 before 6.12.9; 6.13-rc1, 6.13-rc2, 6.13-rc3, 6.13-rc4, 6.13-rc5 — fixed in 6.1.124, 6.12.9, 6.6.70

How to fix

Upgrade to a fixed version: Linux kernel 6.1.124, 6.12.9, 6.6.70. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0179488ca992d79908b8e26b9213f1554fc5bacc
• https://git.kernel.org/stable/c/9d382112b36382aa65aad765f189ebde9926c101
• https://git.kernel.org/stable/c/cff1de87ed14fc0f2332213d2367100e7ad0753a
• https://git.kernel.org/stable/c/d2392b79d8af3714ea8878b71c66dc49d3110f44
• https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html

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