PT-2026-52336 · Linux · Linux
Publicado
2026-06-25
·
Atualizado
2026-06-25
·
CVE-2026-53241
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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.
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