CVE-2026-74497
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, ALSA USB-audio lacks clamping of frame size in implicit-feedback mode. Received sync packet sizes are not limited to the maximum frame size, potentially causing packet transfers beyond hardware limits.
Risk Assessment
This can lead to audio playback malfunction, system crashes, or potential exploitation by malicious USB devices.
Recommendation
Install the updated Linux kernel with the fix that clamps the frame size in snd_usb_handle_sync_urb().
Original NVD description (English source)
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.