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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-90207

ALSA: seq: midi: Serialize input teardown with event_input

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: midi: Serialize input teardown with event_input snd_midi_input_event() must not be running while a rawmidi substream is closing, since this can lead to the trigger state becoming out-of-step through this sequence in snd_rawmidi_input_trigger(): snd_rawmidi_input_trigger(up=0) snd_midi_input_event() -> snd_rawmidi_kernel_read() -> snd_rawmidi_input_trigger(up=1) -> cancel_work_sync() which ends with the underlying device being active unexpectedly. When this is called from close_substream(), further input can re-trigger the input event leaving it running after rawmidi_release_priv() has set rfile->rmidi to NULL which leads to: Unable to handle kernel NULL pointer dereference at virtual address 00000000000000b0 Call trace: snd_midi_input_event+0x3c/0x134 [snd_seq_midi] (P) snd_rawmidi_input_event_work+0x1c/0x2c process_one_work+0x150/0x3a4 worker_thread+0x190/0x318 Apply a similar approach to commit ef7607ab1c8ad ("ALSA: seq: midi: Serialize output teardown with event_input") which fixed the same issue in the output direction, but updated to use RCU following Takashi Iwai's proposed follow-on patch [1]. With this change in place, midisynth_unsubscribe() clears the input file so snd_midi_input_event() will not re-trigger the stream and will be quiesced by the cancel_work_sync() in snd_rawmidi_input_trigger(). [1] https://lore.kernel.org/linux-sound/20260813144224.753399-1-tiwai@suse.de/

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < de76a2b47582cd6dba2e15f024681bf377ecc94aaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 89d986897aff7275b42e075e556731b8353366afaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6290afaae54c7a9fa3bca3b4d5433e6d83e8669daffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 210c193a9ef1312fab153948c6928e4cfaa1f03baffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 282a3ef9e4b63b2f6823bbbb3c1a90b002cdaf12affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 403f7f3ad3808a0096d84cf228fab68dc253fd9daffected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.110 to ≤ 6.12.*unaffected
  • 6.18.52 to ≤ 6.18.*unaffected
  • 7.2.6 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References