CVE-2026-52963

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

• https://git.kernel.org/stable/c/09141583bd97f4bbd7358e29fd138fe798467cdb
• https://git.kernel.org/stable/c/3d3b2b01a3e73828e201ece96f863e7a3e0cdc6e
• https://git.kernel.org/stable/c/728ab0c72e49ca27185067984cd565425eb69b2e
• https://git.kernel.org/stable/c/a0226560540c16717efcceaf15c862cf115b01d3
• https://git.kernel.org/stable/c/c59159ce10e75b568cd0d4b29efcb0fb0ddecc94