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

What is CVE-2026-52963?

CVE-2026-52963 is a medium-severity vulnerability in Linux kernel, published on 24 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Which versions are affected by CVE-2026-52963?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-52963?

Apply the vendor's patch.

Is CVE-2026-52963 being exploited?

There is no known exploitation of CVE-2026-52963 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-52963, DEBIAN-CVE-2026-52963, GHSA-m4vx-wp7v-hx3x, ROOT-OS-DEBIAN-11-CVE-2026-52963, ROOT-OS-DEBIAN-12-CVE-2026-52963, ROOT-OS-UBUNTU-2204-CVE-2026-52963 and 2 more.