Vulnerability in Linux

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (4.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-52963: held from 0.001 to 0.002.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000

Affected products

  • Linux — versions 5c6cd7021a05a02fcf37f360592d7c18d4d807fb, 9e0c71f2f633b0442661966228827d1a33df485f, 0868bc5654c07628c421547f0821650a8c2cb8f3
  • Linux Kernel — versions 7.1

References

Frequently asked questions

What is CVE-2026-52963?
CVE-2026-52963 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2026-06-24.
How severe is CVE-2026-52963?
Medium severity. CVSS v3 base score is 5.5 out of 10.