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CVE-2026-74387: Linux

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: midi: Serialize output teardown with event_input event_process_midi() borrows msynth->output_rfile.output and then passes the substream to dump_midi() and snd_rawmidi_kernel_write() without synchronizing with the output open/close transition. midisynth_use() also publishes output_rfile before snd_rawmidi_output_params() has finished. The last midisynth_unuse() can therefore release the same rawmidi file and free substream->runtime before snd_rawmidi_kernel_write1() takes its runtime buffer reference. That leaves the event_input path using a stale substream or runtime and can end in a NULL-deref or use-after-free. Fix this with two pieces of synchronization. Keep a short IRQ-safe spinlock only for publishing or clearing output_rfile and for pairing the output snapshot with an snd_use_lock_t reference. Once event_process_midi() has taken that in-flight reference, it drops the spinlock before calling snd_seq_dump_var_event(), dump_midi(), or snd_rawmidi_kernel_write(). midisynth_unuse() now detaches the visible rawmidi file under the same spinlock, waits for the in-flight writers to drain, and only then drains and releases the saved file. midisynth_use() likewise opens into a local snd_rawmidi_file and publishes it only after snd_rawmidi_output_params() succeeds. The buggy scenario involves two paths, with each column showing the order within that path: event_input path: last unuse path: 1. event_process_midi() snapshots 1. midisynth_unuse() starts output_rfile.output. tearing down output_rfile. 2. dump_midi() reaches 2. snd_rawmidi_kernel_release() snd_rawmidi_kernel_write() closes the output file. before runtime is pinned. 3. close_substream() frees 3. The callback keeps using substream->runtime. the borrowed substream. Validation reproduced this kernel report: KASAN null-ptr-deref in snd_

Засегнати продукти

  • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди f5d470b808bc01f70978e22e595c6f7768313406; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 936641af564c3d92721704b781e36aaf223efdd2; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 718f6a56b40875f19e6915799044a02df9abfd52; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 11165fe2c5ea0516debe486d91df67abbe36905e; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди d6fd2afb137f52bf00c5210cc44d08ed54dcffb4; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди ef7607ab1c8adc6258fb1b27d08e26aecdc18a58
  • Linux Linux: 2.6.12; преди 2.6.12; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

История

  • 15 август 2026 Публикувано

Други уязвимости в Linux Linux

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CVE-2026-74387: Linux | freedomonline.bg