CVE-2026-52963: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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 products

• Linux Linux Kernel: from 4.4.238, before 4.5 (fixed in 4.5); from 4.9.238, before 4.10 (fixed in 4.10); from 4.14.200, before 4.15 (fixed in 4.15); from 4.19.149, before 4.20 (fixed in 4.20); from 5.4.69, before 5.5 (fixed in 5.5); from 5.7, before 5.10.258 (fixed in 5.10.258); …

Published 2026-06-24. Last modified 2026-07-14.