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CVE-2026-80969: ALSA: mpu401: Check card index validity at probe

• Severity: unknown
• 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: 2026-09-11 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: mpu401: Check card index validity at probe mpu401 driver blindly trusts that the given devptr->id value is within the proper card index range at probe. It's OK for the devices the driver itself creates at the module probe time, but if the device is bound manually via sysfs interface, this could be -1 as "none", and this leads to OOB access for index[] and other parameters. Add a sanity check for the card index and warn/correct it if it's a value out of the range.

Affected products

• Linux kernel: 2.6.16 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/26a25fb4ef4ba2a33069d489feb75a4c36899cca
• https://git.kernel.org/stable/c/3a997371ac2957f11a033a4cec2930042dadb7e3
• https://git.kernel.org/stable/c/4a3d6c22ca6b6c16e8055fb518aa87f5e043f754
• https://git.kernel.org/stable/c/76b6bc38d0f310c0ae1b2a2ebabe2947d92c601a
• https://git.kernel.org/stable/c/8adda66edf795d4648f8e26f312e4414c535d25a
• https://git.kernel.org/stable/c/cc4215cc2a4b2a9cf8b1952bbe8d5bf925acb3ea
• https://git.kernel.org/stable/c/d606c703d1e0c54996cb3db76a753157cb2a3c06
• https://git.kernel.org/stable/c/f7dcecb92ed192ff5fcf842918fb1aaea84b5bdd

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