CVE-2026-52963 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should be aware of this vulnerability. They should review and apply the patch to the Linux kernel's ALSA usb-audio module, update Linux kernel packages to the latest version, and monitor Linux kernel updates and patches for potential vulnerabilities.

Technical summary

The Linux kernel's ALSA usb-audio module has a vulnerability in the snd_usbmidi_get_ms_info() function. The function does not properly validate the size of the MIDIStreaming endpoint descriptor, which could lead to a buffer overflow. This vulnerability has been resolved with a patch that bounds MIDI endpoint descriptor scans. The patch ensures that the descriptor walker stops when bLength is zero or extends past the remaining endpoint-extra scan, preventing flexible-array reads from being bounded by bLength alone.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch to the Linux kernel's ALSA usb-audio module
• Update Linux kernel packages to the latest version
• Monitor Linux kernel updates and patches for potential vulnerabilities
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-06-24T17:17:06.650Z and last modified on 2026-07-10T19:23:34.427Z. The NVD entry is currently Awaiting Analysis. This vulnerability affects the Linux kernel's ALSA usb-audio module, specifically in the snd_usbmidi_get_ms_info() function, which did not properly validate the size of the MIDIStreaming endpoint descriptor. This could potentially lead to a buffer overflow. The vulnerability has been resolved with a patch that bounds MIDI endpoint descriptor scans. Evidence is limited to public CVE and NVD information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.