Riskcovery

CVE-2026-53241

ALSA: seq: dummy: fix UMP event stack overread

State
Published
Severity
Not scored
Published
Jun 25, 2026
Updated
Jun 25, 2026
Reserved
Jun 9, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

ALSA: seq: dummy: fix UMP event stack overread

The dummy sequencer port forwards events by copying an incoming struct snd_seq_event into a stack temporary, rewriting source and destination, and dispatching the temporary to subscribers. That legacy event storage is smaller than struct snd_seq_ump_event.

When a UMP event reaches the dummy client, the copy leaves the UMP flag set but only provides legacy-sized stack storage. The subscriber delivery path then uses snd_seq_event_packet_size() and copies a UMP-sized packet from that stack object, reading past the end of the temporary.

Use the existing union __snd_seq_event storage and copy the packet size reported for the incoming event before rewriting the common routing fields. This preserves the full UMP packet for UMP events while keeping legacy event handling unchanged.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 32cb23a0f911317cdb5030035e49a204aa86fef5 to before a7ef78a2c536242ccb7a4429da01580b2409bb24Affected
  • 32cb23a0f911317cdb5030035e49a204aa86fef5 to before 6671a46144f880c5a167930ebb14c12f3d059fe9Affected
  • 32cb23a0f911317cdb5030035e49a204aa86fef5 to before 6676b6063440561db600494049ce7ffb695c8cc4Affected
  • 32cb23a0f911317cdb5030035e49a204aa86fef5 to before 2b5ff4db5d7aa5b981d966df02e687f79ad7b311Affected
LinuxLinux
  • 6.10Affected
  • before 6.10Not affected
  • 6.12.94 through 6.12.*Not affected
  • 6.18.36 through 6.18.*Not affected
  • 7.0.13 through 7.0.*Not affected
  • 7.1 and laterNot affected

References

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