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ReviewHigh

CVE-2026-74497

Linux

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_...

CVSS
8.4
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.15
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.4

Vulnerability overview

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_...

Affected product and versions

Product
Linux
Affected versions
>= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 2d39fea6d3c19a2f5811d123114d92e3d0115fd1, >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 09cf3dbbb4256a43feb91d2f51f274510a9ada47, >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be, >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 56ac3e7c90f6b45969c3fd07a98fad760ffd6901, >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < be97fea7451d758881b95af78e900dd0d58a382a, >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 2db4535d6af79276a64449201c5be5feffb31c64, >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 53f0aa37eb945f3c983f61d12fc35eb33debb8a9, >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 8d7a30c50c2e58a6839634ed0acde14466d1dc61, >= 3.8
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available