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CVE-2026-74497: ALSA: usb-audio: Clamp frame size in implicit-feedback mode

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-16

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.

Affected products

• Linux kernel: 3.8 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/09cf3dbbb4256a43feb91d2f51f274510a9ada47
• https://git.kernel.org/stable/c/2d39fea6d3c19a2f5811d123114d92e3d0115fd1
• https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64
• https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9
• https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901
• https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61
• https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a
• https://git.kernel.org/stable/c/cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be

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