{"apiVersion":"1.0","identifier":"CVE-2026-74601","description":"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.","publishedAt":"2026-08-22T16:16:32","lastModifiedAt":"2026-08-25T06:18:36","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74601","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00136,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74601","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74601","en":"https://www.redsauce.net/en/cves/CVE-2026-74601","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74601","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74601","de":"https://www.redsauce.net/de/cves/CVE-2026-74601","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74601","el":"https://www.redsauce.net/el/cves/CVE-2026-74601"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74601"}}