What’s Vulnerable › Vulnerabilities

CVE-2026-43126: ALSA: mixer: oss: Add card disconnect checkpoints

• Severity: high (CVSS 7.8 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: 2026-05-06 · updated 2026-10-30

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.

Affected products

• Linux kernel: from 2.6.12 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6 — fixed in 6.12.75, 6.18.16, 6.19.6
• Linux: 2.6.12 — fixed in 7.0

How to fix

Upgrade to a fixed version: Linux kernel 6.12.75, 6.18.16, 6.19.6; Linux 7.0. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/084d5d44418148662365eced3e126ad1a81ee3e2
• https://git.kernel.org/stable/c/11ecfba92bdb420456a48da45a756b24d6356f72
• https://git.kernel.org/stable/c/20c52a70414095447da1be076f492cc7a6dce7cf
• https://git.kernel.org/stable/c/8c097cf736993454acf3f711a3b376d6c7ad8965
• https://git.kernel.org/stable/c/ae583f113d15fa97e5234133c20d09f8e6214e47
• https://git.kernel.org/stable/c/e6645e625480cdf1079a4265f758d13b70721029

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