CVE-2026-31776: Linux kernel · ALSA: ctxfi: Fix missing SPDIFI1 index handling
Affects Linux kernelSource CVE Database V5
Not known to be exploited : upgrade to b045ab3dff97edae6d538eeff900a34c098761f8 or 950decf59d4e978b60a792ce0b3e1555a608f489 when convenient.
Data as of 6 Nov 2026, 16:33 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in b045ab3dff97edae6d538eeff900a34c098761f8, 950decf59d4e978b60a792ce0b3e1555a608f489
Exploitation evidence
Disclosed: evidence found.
CVE published 1 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade Linux kernel to b045ab3dff97edae6d538eeff900a34c098761f8 or 950decf59d4e978b60a792ce0b3e1555a608f489.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available and has been applied in the Linux kernel commits b045ab3dff97edae6d538eeff900a34c098761f8 and 950decf59d4e978b60a792ce0b3e1555a608f489. Users and administrators should update to the fixed kernel versions or apply the relevant patches to mitigate this vulnerability.
Description
A vulnerability in the Linux kernel ALSA ctxfi component caused improper handling of the SPDIFI1 DAIO type, leading to an out-of-bounds array access. This was due to the daio_device_index() function returning an invalid value (-EINVAL) instead of the correct index. The issue has been fixed by aligning the handling of SPDIFI1 with the hw20k1 pattern to return the proper index.