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VulnerabilityPublished Updated

CVE-2026-74499: Linux kernel · ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ce949d66607cfb000b8d8d84f80f35a886e72683 : patch Linux kernel soon.

Data as of 6 Nov 2026, 17:56 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

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 ce949d66607cfb000b8d8d84f80f35a886e72683, b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081, 0970274613fb463d376211450cab066d34ebfe6a +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 4434ade8c9334a3ab975d8993de456f06841899e, < ce949d66607cfb000b8d8d84f80f35a886e72683
Fixed in
  • ce949d66607cfb000b8d8d84f80f35a886e72683
LinuxLinuxAffected
  • ≥ 4434ade8c9334a3ab975d8993de456f06841899e, < b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081
Fixed in
  • b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081
LinuxLinuxAffected
  • ≥ 4434ade8c9334a3ab975d8993de456f06841899e, < 0970274613fb463d376211450cab066d34ebfe6a
Fixed in
  • 0970274613fb463d376211450cab066d34ebfe6a
LinuxLinuxAffected
  • ≥ 4434ade8c9334a3ab975d8993de456f06841899e, < 78dfdeb8d2065524ed5928d6470bf3d3244d1009
Fixed in
  • 78dfdeb8d2065524ed5928d6470bf3d3244d1009
LinuxLinuxAffected
  • ≥ 4434ade8c9334a3ab975d8993de456f06841899e, < 29a4c29943631301e85f5e9d10f25741bd78e7ba
Fixed in
  • 29a4c29943631301e85f5e9d10f25741bd78e7ba
LinuxLinuxAffected
  • ≥ 4434ade8c9334a3ab975d8993de456f06841899e, < 9b22a5c8310b0d55d04f5f0159b913a2fb8b444f
Fixed in
  • 9b22a5c8310b0d55d04f5f0159b913a2fb8b444f

AI-suggested

A fix for this vulnerability has been implemented in the Linux kernel source code. Systems running affected versions should apply the official patches or upgrade to a fixed kernel version. No additional mitigation steps are indicated beyond applying the fix.

Description

A vulnerability in the Linux kernel ALSA usb-audio driver (snd_usbmidi_akai_output function) allows an out-of-bounds write when a USB device advertises a very small bulk-OUT endpoint. This occurs due to a signed integer underflow in computing the buffer boundary, causing the loop to write beyond the allocated buffer when writing to /dev/snd/midiC*D* nodes. The issue has been fixed by adding an early return to prevent the loop from running with an invalid bound.

References

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