VulnerabilityPublished 24 Apr 2026Updated 6 Nov 2026

CVE-2026-31620: Linux kernel · ALSA: usx2y: us144mkii: fix NULL deref on missing interface 0

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fbaf29ce00e7bce683f3faf4f2b326bd0a9e6602 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

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 fbaf29ce00e7bce683f3faf4f2b326bd0a9e6602, d04dd67ab10dc978c6c843c6bd6a2a66a9444f51, 48bd344e1040b9f2eb512be73c13f5db83efc191 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Apr 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to fbaf29ce00e7bce683f3faf4f2b326bd0a9e6602, d04dd67ab10dc978c6c843c6bd6a2a66a9444f51, 48bd344e1040b9f2eb512be73c13f5db83efc191 or 09b145c1f1331c40dc955c0024d636f25417cddb.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ dee1bcf28a3dd13ddb2e9200407864f73e9c4d63, < fbaf29ce00e7bce683f3faf4f2b326bd0a9e6602	Fixed in fbaf29ce00e7bce683f3faf4f2b326bd0a9e6602
LinuxLinux	Affected ≥ dee1bcf28a3dd13ddb2e9200407864f73e9c4d63, < d04dd67ab10dc978c6c843c6bd6a2a66a9444f51	Fixed in d04dd67ab10dc978c6c843c6bd6a2a66a9444f51
LinuxLinux	Affected ≥ dee1bcf28a3dd13ddb2e9200407864f73e9c4d63, < 48bd344e1040b9f2eb512be73c13f5db83efc191	Fixed in 48bd344e1040b9f2eb512be73c13f5db83efc191
LinuxLinux	Affected ≥ dee1bcf28a3dd13ddb2e9200407864f73e9c4d63, < 09b145c1f1331c40dc955c0024d636f25417cddb	Fixed in 09b145c1f1331c40dc955c0024d636f25417cddb
LinuxLinux	Affected =6.18	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usx2y: us144mkii: fix NULL deref on missing interface 0 A malicious USB device with the TASCAM US-144MKII device id can have a configuration containing bInterfaceNumber=1 but no interface 0. USB configuration descriptors are not required to assign interface numbers sequentially, so usb_ifnum_to_if(dev, 0) returns will NULL, which will then be dereferenced directly. Fix this up by checking the return value properly.

References

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