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CVE-2026-68202: Linux, грешка в паметта

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.

CVE радар: още уязвимости от този вид

  • 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: close a re-opened queue timer in the destructor queue_delete() closes the queue timer, then frees it. snd_seq_timer_close() clears q->timer->timeri. snd_use_lock_sync() then drains borrowers, and snd_seq_timer_delete() frees q->timer. A borrower can re-open the timer inside that window. A SET_QUEUE_CLIENT that took a queueptr() use_lock reference before the queue was unlinked runs snd_seq_timer_open() after the close. Open refuses re-open only while timeri is set, and the close just cleared it, so it re-opens timeri. snd_seq_timer_delete() does not close that instance. Its snd_seq_timer_stop() is a no-op, because running was cleared first. So it frees q->timer with the instance still live. The queue is freed next. The instance stays on the global timer with callback_data pointing at the freed queue. A non-owner START on the unlocked queue arms it. The next tick derefs the freed queue in snd_seq_timer_interrupt(). Reachable by an unprivileged user with access to /dev/snd/seq. No CAP and no queue ownership required. Close any lingering instance in the destructor. There, ->timeri can no longer change: the queue is unlinked and all use_lock borrowers have drained, so no snd_seq_queue_use() can re-open it. Close it before clearing q->timer. snd_timer_close() waits for any in-flight snd_seq_timer_interrupt() to finish, and that callback still reads q->timer (via snd_seq_check_queue()), so q->timer must stay valid until it drains.

Засегнати продукти

  • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди b7feeaca1f53b10df9b4de9eaf611767ca70dc92; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 7478ef94b49bc9789cf1a003deec58b42283dde4; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 9d9be6fc30f384f92c4e1b8ed40bd9d4796b7833; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди fb40d03ed792a8a8bf77aa0ee15df57b0ff78b07; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 24f0cabf173539f048946c8fc221131dc221f277; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 6a10025c7fd09a7d2af37a3ae1da188569fce470; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 31a6163e301d832060f8236f1ed17cbc1ca198df; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 2c4dc0ed50b05cd847a4b34b8cebf0775f19aeb9
  • Linux Linux: 2.6.12; преди 2.6.12; 5.10.266 до 5.10.*; 5.15.217 до 5.15.*; 6.1.183 до 6.1.*; 6.6.148 до 6.6.*; 6.12.101 до 6.12.*; 6.18.42 до 6.18.*; 7.1.6 до 7.1.*; от 7.2 нататък

Вид слабост

История

  • 10 август 2026 Публикувано

Други уязвимости в Linux Linux

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