{"api_version":"1","generated_at":"2026-08-23T21:52:48+00:00","cve":"CVE-2026-74601","urls":{"html":"https://cve.report/CVE-2026-74601","api":"https://cve.report/api/cve/CVE-2026-74601.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74601","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74601"},"summary":{"title":"ring-buffer: Use current_context for safe per-CPU buffer swap","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Use current_context for safe per-CPU buffer swap\n\nThe ring_buffer_swap_cpu() function currently checks the per-CPU\ncommitting counter to determine if a buffer is actively being written to\nbefore performing the swap. However, there exists a race window where\nthis check can be bypassed:\n\n    ring_buffer_lock_reserve\n        cpu_buffer = buffer->buffers[cpu];       // cpu_buffer_a\n        rb_reserve_next_event\n            rb_start_commit // inc committing\n            if (unlikely(READ_ONCE(cpu_buffer->buffer) != buffer)) {...}\n            __rb_reserve_next\n                rb_move_tail\n                    rb_end_commit(cpu_buffer);   // dec committing => 0\n                    /* interrupt hits here, successfully swaps! */\n                    local_inc(&cpu_buffer->committing);\n\n    ring_buffer_unlock_commit\n        cpu_buffer = buffer->buffers[cpu];      // cpu_buffer_b\n        rb_commit\n            rb_end_commit\n            RB_WARN_ON(cpu_buffer, !local_read(&cpu_buffer->committing))\n                                                // triggers warning\n\nThe committing counter can temporarily drop to 0 during a single write\noperation (within rb_move_tail), creating a window where swap can\nsucceed even though the write is still in progress. This leads to\ninconsistent buffer state and triggers the RB_WARN_ON in rb_commit().\n\nReplace the committing counter check with current_context checks, which\nare set at the entry of ring_buffer_lock_reserve() and remain valid\nthroughout the entire write operation, providing a reliable indicator of\nbuffer busy state during swap.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:32","updated_at":"2026-08-23 13:16:46"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/26662bc8fced1d668fa1aa146eda085bfc67bd0b","name":"https://git.kernel.org/stable/c/26662bc8fced1d668fa1aa146eda085bfc67bd0b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ad7e10c7ea89af45ac1bf1814855d45da472703d","name":"https://git.kernel.org/stable/c/ad7e10c7ea89af45ac1bf1814855d45da472703d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f27bdc43077e4fcb5557dfc315ee8d91e741f483","name":"https://git.kernel.org/stable/c/f27bdc43077e4fcb5557dfc315ee8d91e741f483","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f","name":"https://git.kernel.org/stable/c/5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6b524e6b234e45c7f5f90d13b042c6f57f80105c","name":"https://git.kernel.org/stable/c/6b524e6b234e45c7f5f90d13b042c6f57f80105c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5e6e2a18c20e88167d414f666032792e8bf19b80","name":"https://git.kernel.org/stable/c/5e6e2a18c20e88167d414f666032792e8bf19b80","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/597f279b7b4a06412e3d965e98cc36e181cdbede","name":"https://git.kernel.org/stable/c/597f279b7b4a06412e3d965e98cc36e181cdbede","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/22709117d9ae95e52673685f98caac7c356a8227","name":"https://git.kernel.org/stable/c/22709117d9ae95e52673685f98caac7c356a8227","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74601","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74601","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 26662bc8fced1d668fa1aa146eda085bfc67bd0b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 6b524e6b234e45c7f5f90d13b042c6f57f80105c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 597f279b7b4a06412e3d965e98cc36e181cdbede git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 22709117d9ae95e52673685f98caac7c356a8227 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 ad7e10c7ea89af45ac1bf1814855d45da472703d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 5e6e2a18c20e88167d414f666032792e8bf19b80 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4239c38fe0b3847e1e6d962c74b41b08ba0e2990 f27bdc43077e4fcb5557dfc315ee8d91e741f483 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.5","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.266 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.217 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.184 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.153 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.105 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/trace/ring_buffer.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"26662bc8fced1d668fa1aa146eda085bfc67bd0b","status":"affected","version":"4239c38fe0b3847e1e6d962c74b41b08ba0e2990","versionType":"git"},{"lessThan":"6b524e6b234e45c7f5f90d13b042c6f57f80105c","status":"affected","version":"4239c38fe0b3847e1e6d962c74b41b08ba0e2990","versionType":"git"},{"lessThan":"597f279b7b4a06412e3d965e98cc36e181cdbede","status":"affected","version":"4239c38fe0b3847e1e6d962c74b41b08ba0e2990","versionType":"git"},{"lessThan":"22709117d9ae95e52673685f98caac7c356a8227","status":"affected","version":"4239c38fe0b3847e1e6d962c74b41b08ba0e2990","versionType":"git"},{"lessThan":"ad7e10c7ea89af45ac1bf1814855d45da472703d","status":"affected","version":"4239c38fe0b3847e1e6d962c74b41b08ba0e2990","versionType":"git"},{"lessThan":"5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f","status":"affected","version":"4239c38fe0b3847e1e6d962c74b41b08ba0e2990","versionType":"git"},{"lessThan":"5e6e2a18c20e88167d414f666032792e8bf19b80","status":"affected","version":"4239c38fe0b3847e1e6d962c74b41b08ba0e2990","versionType":"git"},{"lessThan":"f27bdc43077e4fcb5557dfc315ee8d91e741f483","status":"affected","version":"4239c38fe0b3847e1e6d962c74b41b08ba0e2990","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/trace/ring_buffer.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.5"},{"lessThan":"4.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.266","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.217","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.184","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.153","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.105","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.45","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.266","versionStartIncluding":"4.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.217","versionStartIncluding":"4.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.184","versionStartIncluding":"4.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.153","versionStartIncluding":"4.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.105","versionStartIncluding":"4.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"4.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"4.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"4.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Use current_context for safe per-CPU buffer swap\n\nThe ring_buffer_swap_cpu() function currently checks the per-CPU\ncommitting counter to determine if a buffer is actively being written to\nbefore performing the swap. However, there exists a race window where\nthis check can be bypassed:\n\n    ring_buffer_lock_reserve\n        cpu_buffer = buffer->buffers[cpu];       // cpu_buffer_a\n        rb_reserve_next_event\n            rb_start_commit // inc committing\n            if (unlikely(READ_ONCE(cpu_buffer->buffer) != buffer)) {...}\n            __rb_reserve_next\n                rb_move_tail\n                    rb_end_commit(cpu_buffer);   // dec committing => 0\n                    /* interrupt hits here, successfully swaps! */\n                    local_inc(&cpu_buffer->committing);\n\n    ring_buffer_unlock_commit\n        cpu_buffer = buffer->buffers[cpu];      // cpu_buffer_b\n        rb_commit\n            rb_end_commit\n            RB_WARN_ON(cpu_buffer, !local_read(&cpu_buffer->committing))\n                                                // triggers warning\n\nThe committing counter can temporarily drop to 0 during a single write\noperation (within rb_move_tail), creating a window where swap can\nsucceed even though the write is still in progress. This leads to\ninconsistent buffer state and triggers the RB_WARN_ON in rb_commit().\n\nReplace the committing counter check with current_context checks, which\nare set at the entry of ring_buffer_lock_reserve() and remain valid\nthroughout the entire write operation, providing a reliable indicator of\nbuffer busy state during swap."}],"providerMetadata":{"dateUpdated":"2026-08-23T12:47:42.030Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/26662bc8fced1d668fa1aa146eda085bfc67bd0b"},{"url":"https://git.kernel.org/stable/c/6b524e6b234e45c7f5f90d13b042c6f57f80105c"},{"url":"https://git.kernel.org/stable/c/597f279b7b4a06412e3d965e98cc36e181cdbede"},{"url":"https://git.kernel.org/stable/c/22709117d9ae95e52673685f98caac7c356a8227"},{"url":"https://git.kernel.org/stable/c/ad7e10c7ea89af45ac1bf1814855d45da472703d"},{"url":"https://git.kernel.org/stable/c/5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f"},{"url":"https://git.kernel.org/stable/c/5e6e2a18c20e88167d414f666032792e8bf19b80"},{"url":"https://git.kernel.org/stable/c/f27bdc43077e4fcb5557dfc315ee8d91e741f483"}],"title":"ring-buffer: Use current_context for safe per-CPU buffer swap","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74601","datePublished":"2026-08-22T15:31:50.092Z","dateReserved":"2026-08-15T05:44:03.919Z","dateUpdated":"2026-08-23T12:47:42.030Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:32","lastModifiedDate":"2026-08-23 13:16:46","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74601","Ordinal":"1","Title":"ring-buffer: Use current_context for safe per-CPU buffer swap","CVE":"CVE-2026-74601","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74601","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Use current_context for safe per-CPU buffer swap\n\nThe ring_buffer_swap_cpu() function currently checks the per-CPU\ncommitting counter to determine if a buffer is actively being written to\nbefore performing the swap. However, there exists a race window where\nthis check can be bypassed:\n\n    ring_buffer_lock_reserve\n        cpu_buffer = buffer->buffers[cpu];       // cpu_buffer_a\n        rb_reserve_next_event\n            rb_start_commit // inc committing\n            if (unlikely(READ_ONCE(cpu_buffer->buffer) != buffer)) {...}\n            __rb_reserve_next\n                rb_move_tail\n                    rb_end_commit(cpu_buffer);   // dec committing => 0\n                    /* interrupt hits here, successfully swaps! */\n                    local_inc(&cpu_buffer->committing);\n\n    ring_buffer_unlock_commit\n        cpu_buffer = buffer->buffers[cpu];      // cpu_buffer_b\n        rb_commit\n            rb_end_commit\n            RB_WARN_ON(cpu_buffer, !local_read(&cpu_buffer->committing))\n                                                // triggers warning\n\nThe committing counter can temporarily drop to 0 during a single write\noperation (within rb_move_tail), creating a window where swap can\nsucceed even though the write is still in progress. This leads to\ninconsistent buffer state and triggers the RB_WARN_ON in rb_commit().\n\nReplace the committing counter check with current_context checks, which\nare set at the entry of ring_buffer_lock_reserve() and remain valid\nthroughout the entire write operation, providing a reliable indicator of\nbuffer busy state during swap.","Type":"Description","Title":"ring-buffer: Use current_context for safe per-CPU buffer swap"}]}}}