VulnerabilityPublished 24 Jun 2026Updated 6 Nov 2026

CVE-2026-52963: Linux kernel · ALSA: usb-audio: Bound MIDI endpoint descriptor scans

Affects Linux kernelSource CVE Database V5

Compare

Not known to be exploited · fixed in e2f1260a056eb3215c13c48c5378f3e4112dc3af : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 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 e2f1260a056eb3215c13c48c5378f3e4112dc3af, d6854daa67be623860f4e1873fd3d3c275aba4ed, c59159ce10e75b568cd0d4b29efcb0fb0ddecc94 +10

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Jun 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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=4.4.238 <4.5 >=4.9.238 <4.10 >=4.14.200 <4.15 >=4.19.149 <4.20 >=5.4.69 <5.5	Fixed in e2f1260a056eb3215c13c48c5378f3e4112dc3af d6854daa67be623860f4e1873fd3d3c275aba4ed c59159ce10e75b568cd0d4b29efcb0fb0ddecc94 c65b137d351e21cbc5630e73ef0eb1e1d75f5b20 a0226560540c16717efcceaf15c862cf115b01d3 09141583bd97f4bbd7358e29fd138fe798467cdb 728ab0c72e49ca27185067984cd565425eb69b2e 5.5 4.20 4.15 4.10 4.5 3d3b2b01a3e73828e201ece96f863e7a3e0cdc6e
LinuxLinux	Affected =5.7	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Bound MIDI endpoint descriptor scans snd_usbmidi_get_ms_info() validates the internal MIDIStreaming endpoint descriptor size before using baAssocJackID[], but the descriptor walker can still return a class-specific endpoint descriptor whose bLength exceeds the remaining bytes in the endpoint-extra scan. That leaves later flexible-array reads bounded by bLength, but not by the remaining bytes in the endpoint-extra scan. Stop walking when bLength is zero or extends past the remaining endpoint-extra scan.

References

Community reviews

Loading reviews…