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CVE-2026-74601: 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: ring-buffer: Use current_context for safe per-CPU buffer swap The ring_buffer_swap_cpu() function currently checks the per-CPU committing counter to determine if a buffer is actively being written to before performing the swap. However, there exists a race window where this check can be bypassed: ring_buffer_lock_reserve cpu_buffer = buffer->buffers[cpu]; // cpu_buffer_a rb_reserve_next_event rb_start_commit // inc committing if (unlikely(READ_ONCE(cpu_buffer->buffer) != buffer)) {...} __rb_reserve_next rb_move_tail rb_end_commit(cpu_buffer); // dec committing => 0 /* interrupt hits here, successfully swaps! */ local_inc(&cpu_buffer->committing); ring_buffer_unlock_commit cpu_buffer = buffer->buffers[cpu]; // cpu_buffer_b rb_commit rb_end_commit RB_WARN_ON(cpu_buffer, !local_read(&cpu_buffer->committing)) // triggers warning The committing counter can temporarily drop to 0 during a single write operation (within rb_move_tail), creating a window where swap can succeed even though the write is still in progress. This leads to inconsistent buffer state and triggers the RB_WARN_ON in rb_commit(). Replace the committing counter check with current_context checks, which are set at the entry of ring_buffer_lock_reserve() and remain valid throughout the entire write operation, providing a reliable indicator of buffer busy state during swap.

Засегнати продукти

  • Linux Linux: 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 преди 26662bc8fced1d668fa1aa146eda085bfc67bd0b; 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 преди 6b524e6b234e45c7f5f90d13b042c6f57f80105c; 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 преди 597f279b7b4a06412e3d965e98cc36e181cdbede; 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 преди 22709117d9ae95e52673685f98caac7c356a8227; 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 преди ad7e10c7ea89af45ac1bf1814855d45da472703d; 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 преди 5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f; 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 преди 5e6e2a18c20e88167d414f666032792e8bf19b80; 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 преди f27bdc43077e4fcb5557dfc315ee8d91e741f483
  • Linux Linux: 4.5; преди 4.5; 5.10.266 до 5.10.*; 5.15.217 до 5.15.*; 6.1.184 до 6.1.*; 6.6.153 до 6.6.*; 6.12.105 до 6.12.*; 6.18.45 до 6.18.*; 7.1.9 до 7.1.*; от 7.2 нататък

История

  • 22 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-74601: Linux | freedomonline.bg