Threats Tagged 'cve-2026-53241'

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.

A vulnerability in the Linux kernel ALSA dummy sequencer port causes a stack overread when handling UMP events. The issue arises because the dummy client copies an incoming event into a smaller legacy-sized stack buffer while leaving the UMP flag set, leading to reading beyond the buffer during subscriber delivery. This has been fixed by using a union that accommodates the full UMP packet size, preserving correct event handling.