CVE-2026-31777: ALSA: ctxfi: Check the error for index mapping

Severity: medium (CVSS 5.5 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: 2026-05-01 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: ctxfi: Check the error for index mapping The ctxfi driver blindly assumed a proper value returned from daio_device_index(), but it's not always true. Add a proper error check to deal with the error from the function.

Affected products

Linux kernel: from 2.6.31 before 6.19.12; 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4, 7.0-rc5, 7.0-rc6 — fixed in 6.19.12

How to fix

Upgrade to a fixed version: Linux kernel 6.19.12. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/277c6960d4ddb94d16198afd70c92c3d4593d131
https://git.kernel.org/stable/c/971854e7b6ddda78669d3d0cf6566c7b8aca1fdb
https://git.kernel.org/stable/c/d4d3b8cbb70a2de247cbfe99bdb232aef9ed59bc

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