CVE-2026-53241 is a vulnerability in Linux Kernel
Published on June 25, 2026
ALSA: seq: dummy: fix UMP event stack overread
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.
Products Associated with CVE-2026-53241
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Affected Versions
Linux:- Version 32cb23a0f911317cdb5030035e49a204aa86fef5 and below a7ef78a2c536242ccb7a4429da01580b2409bb24 is affected.
- Version 32cb23a0f911317cdb5030035e49a204aa86fef5 and below 6671a46144f880c5a167930ebb14c12f3d059fe9 is affected.
- Version 32cb23a0f911317cdb5030035e49a204aa86fef5 and below 6676b6063440561db600494049ce7ffb695c8cc4 is affected.
- Version 32cb23a0f911317cdb5030035e49a204aa86fef5 and below 2b5ff4db5d7aa5b981d966df02e687f79ad7b311 is affected.
- Version 6.10 is affected.
- Before 6.10 is unaffected.
- Version 6.12.94, <= 6.12.* is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.