CVE-2026-52963
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.
Affected versions
Linux kernel versions
4.4.238,
4.9.238,
4.14.200,
4.19.149,
5.4.69,
5.7
and later are affected. Fixed in
5.10.258,
5.15.209,
6.1.175,
6.6.141,
6.12.91,
6.18.33,
7.0.10,
7.1
and their respective stable series.
References
8 totalFrequently asked questions
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What is CVE-2026-52963?
CVE-2026-52963 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.4.238 onward and has been patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-52963 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-52963?
Yes — CVE-2026-52963 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 4.4.238 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-52963 actively exploited?
No — CVE-2026-52963 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.