CVE-2026-74497
Received Received - Intake

USB Audio Driver Frame Size Clamping Vulnerability

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Clamp frame size in implicit-feedback mode snd_usb_handle_sync_urb() scales received sync packet sizes by the sender's stride and stores the result directly in out_packet->packet_size[i]. If a connected USB device sends an oversized sync packet, this frame count can exceed ep->maxframesize. The un-clamped frame count then propagates to the playback endpoint queue, potentially driving packet transfers beyond the endpoint's hardware frame limits. Cap the calculated frame count against ep->maxframesize in snd_usb_handle_sync_urb() to prevent oversized packets from entering the playback queue.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-74497
EUVD
EUVD-2026-59690

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability in the Linux kernel involves improper handling of USB audio device sync packets. When a connected USB device sends an oversized sync packet, the kernel's snd_usb_handle_sync_urb() function calculates a frame size that exceeds the endpoint's maximum allowed frame size. This unclamped frame count can then cause the playback endpoint queue to process packets beyond hardware limits, potentially leading to system instability or crashes.

Detection Guidance

This vulnerability is specific to the Linux kernel's ALSA USB-audio driver and may not have direct network detection methods. Check kernel logs for USB-audio related errors or warnings using dmesg | grep -i usb-audio or journalctl -k | grep -i usb-audio. Monitor for oversized sync packets or frame count errors.

Impact Analysis

If exploited, this vulnerability could cause system instability, crashes, or denial of service on affected Linux systems using USB audio devices. It may also lead to unexpected behavior in audio playback or recording applications.

Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this vulnerability. If immediate patching is not possible, consider disabling USB-audio devices temporarily or restricting their use until the update is applied.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-74497. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart