Bug 2464389 (CVE-2026-31775)

Summary: CVE-2026-31775 kernel: ALSA: ctxfi: Don't enumerate SPDIF1 at DAIO initialization
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's ALSA (Advanced Linux Sound Architecture) ctxfi driver. An issue during the initialization of Digital Audio Input/Output (DAIO) resources incorrectly enumerates the SPDIF1 type, which is not defined for certain hardware models. This can lead to a kernel crash on affected systems, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-05-01 15:03:58 UTC
In the Linux kernel, the following vulnerability has been resolved:

ALSA: ctxfi: Don't enumerate SPDIF1 at DAIO initialization

The recent refactoring of xfi driver changed the assignment of
atc->daios[] at atc_get_resources(); now it loops over all enum
DAIOTYP entries while it looped formerly only a part of them.
The problem is that the last entry, SPDIF1, is a special type that
is used only for hw20k1 CTSB073X model (as a replacement of SPDIFIO),
and there is no corresponding definition for hw20k2.  Due to the lack
of the info, it caused a kernel crash on hw20k2, which was already
worked around by the commit b045ab3dff97 ("ALSA: ctxfi: Fix missing
SPDIFI1 index handling").

This patch addresses the root cause of the regression above properly,
simply by skipping the incorrect SPDIF1 type in the parser loop.

For making the change clearer, the code is slightly arranged, too.