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CVE-2025-37891 is an out-of-bounds write in the Linux kernel ALSA Universal MIDI Packet (UMP) MIDI 1.0-to-UMP conversion path. The conversion routine maintains an internal buffer sized for four bytes, based on ordinary MIDI 1.0 UMP packet data. It fails to account for the distinct SysEx UMP representation, for which do_convert_to_ump() can handle up to six bytes. Processing an overlong SysEx message can therefore write past the buffer and corrupt kernel memory. The defect was reported as introduced in Linux 6.5.
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Linux kernel ALSA UMP buffer-overflow vulnerability triggered by a malformed UMP SysEx message.
A buffer-overflow vulnerability in the Linux kernel ALSA UMP handling, reachable through a malformed UMP SysEx message.
A Linux kernel ALSA UMP MIDI 1.0-to-UMP SysEx conversion buffer overflow. The internal input buffer was four bytes although SysEx UMP messages can require up to six bytes, allowing memory corruption when processing a longer SysEx message.
Linux kernel ALSA buffer-overflow flaw triggered through a malformed UMP SysEx message.
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