CVE-2026-31775

Local kernel crash via invalid SPDIF1 enumeration

Published May 1, 2026 · Updated May 1, 2026

An ALSA ctxfi driver flaw in Linux Kernel 6.19 allows local users to crash the kernel on systems with hw20k2 audio hardware. The atc_get_resources() loop enumerates every DAIOTYP value and assigns SPDIF1 even though hw20k2 provides no matching DAIO definition. Reachability requires the ctxfi driver on hw20k2 hardware; triggering DAIO initialization interrupts the entire system without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An ALSA ctxfi driver flaw in Linux Kernel 6.19 allows local users to crash the kernel on systems with hw20k2 audio hardware. The atc_get_resources() loop enumerates every DAIOTYP value and assigns SPDIF1 even though hw20k2 provides no matching DAIO definition. Reachability requires the ctxfi driver on hw20k2 hardware; triggering DAIO initialization interrupts the entire system without reported data disclosure or modification.

The record

CVE
CVE-2026-31775
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.19
  2. Affected versionversion=a2dbaeb5c61ef110ceefe0d48fe94d428d3bcf16 <75dc1980cf48826287e43dc7a49e310c6691f97e
  3. Affected versionversion=a2dbaeb5c61ef110ceefe0d48fe94d428d3bcf16 <a79c4c42057818bd9de45d2627464b4f0e02196a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=a2dbaeb5c61ef110ceefe0d48fe94d428d3bcf16 <75dc1980cf48826287e43dc7a49e310c6691f97e; version=a2dbaeb5c61ef110ceefe0d48fe94d428d3bcf16 <a79c4c42057818bd9de45d2627464b4f0e02196a

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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