ALSA: seq: dummy: fix UMP event stack overread

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Summary

CVECVE-2026-53241
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:42 UTC
Updated2026-06-25 09:16:42 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001750000 probability, percentile 0.072040000 (date 2026-06-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 32cb23a0f911317cdb5030035e49a204aa86fef5 a7ef78a2c536242ccb7a4429da01580b2409bb24 git Not specified
CNA Linux Linux affected 32cb23a0f911317cdb5030035e49a204aa86fef5 6671a46144f880c5a167930ebb14c12f3d059fe9 git Not specified
CNA Linux Linux affected 32cb23a0f911317cdb5030035e49a204aa86fef5 6676b6063440561db600494049ce7ffb695c8cc4 git Not specified
CNA Linux Linux affected 32cb23a0f911317cdb5030035e49a204aa86fef5 2b5ff4db5d7aa5b981d966df02e687f79ad7b311 git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a7ef78a2c536242ccb7a4429da01580b2409bb24 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b5ff4db5d7aa5b981d966df02e687f79ad7b311 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6671a46144f880c5a167930ebb14c12f3d059fe9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6676b6063440561db600494049ce7ffb695c8cc4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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