{"id":"DEBIAN-CVE-2026-74601","details":"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-\u003ebuffers[cpu];       // cpu_buffer_a         rb_reserve_next_event             rb_start_commit // inc committing             if (unlikely(READ_ONCE(cpu_buffer-\u003ebuffer) != buffer)) {...}             __rb_reserve_next                 rb_move_tail                     rb_end_commit(cpu_buffer);   // dec committing =\u003e 0                     /* interrupt hits here, successfully swaps! */                     local_inc(&cpu_buffer-\u003ecommitting);      ring_buffer_unlock_commit         cpu_buffer = buffer-\u003ebuffers[cpu];      // cpu_buffer_b         rb_commit             rb_end_commit             RB_WARN_ON(cpu_buffer, !local_read(&cpu_buffer-\u003ecommitting))                                                 // 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.","modified":"2026-09-19T22:01:28.061470093Z","published":"2026-08-22T16:16:32.530Z","upstream":["CVE-2026-74601"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-74601"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.187-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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