{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74601", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.919Z", "datePublished": "2026-08-22T15:31:50.092Z", "dateUpdated": "2026-08-22T15:31:50.092Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:31:50.092Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/ring_buffer.c"], "versions": [{"version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990", "lessThan": "5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f", "status": "affected", "versionType": "git"}, {"version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990", "lessThan": "5e6e2a18c20e88167d414f666032792e8bf19b80", "status": "affected", "versionType": "git"}, {"version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990", "lessThan": "f27bdc43077e4fcb5557dfc315ee8d91e741f483", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/ring_buffer.c"], "versions": [{"version": "4.5", "status": "affected"}, {"version": "0", "lessThan": "4.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "7.2"}]}]}], "references": [{"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"}}}}

{}

{"affected": [{"affectedData": [{"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": "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": "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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-74601", "lastModified": "2026-08-22T16:16:32.530", "metrics": {}, "published": "2026-08-22T16:16:32.530", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5e6e2a18c20e88167d414f666032792e8bf19b80"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f27bdc43077e4fcb5557dfc315ee8d91e741f483"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4239c38fe0b3847e1e6d962c74b41b08ba0e2990,5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4239c38fe0b3847e1e6d962c74b41b08ba0e2990,5e6e2a18c20e88167d414f666032792e8bf19b80)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4239c38fe0b3847e1e6d962c74b41b08ba0e2990,f27bdc43077e4fcb5557dfc315ee8d91e741f483)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T17:30:02.932124+00:00", "updated": "2026-08-22T18:15:03.352497+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362"]}