{"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": "2026-08-25T05:40:26.170Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:26.170Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local tracefs writes to snapshot or latency tracers; ring_buffer_swap_cpu() is only reached from update_max_tr_single() via tracing_snapshot_write or irqsoff/preemptoff tracers, with no network, adjacent, or physical entry path.\nAC:L - The attacker controls both sides of the race by enabling irqsoff/preemptoff tracing or hammering per_cpu/*/snapshot while generating trace events that cross page boundaries, reliably hitting the rb_move_tail window where committing briefly drops to zero.\nPR:L - tracing_check_open_get_tr() enforces only LOCKDOWN_TRACEFS and DAC with no capable() check; tracefs gid= mounts, Android/Perfetto/ChromeOS tracing groups, and container user+mount namespaces routinely grant unprivileged local write access to snapshot and current_tracer.\nUI:N - The attacker enables tracers and triggers buffer swaps through their own tracefs writes and syscalls; no victim cooperation, unrelated user action, or third-party interaction is required.\nS:U - Impact is corrupted kernel ring-buffer metadata and WARN_ON within the same kernel security domain; this is not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - Swapping per-CPU buffers mid-write leaves ring_buffer_per_cpu page, tail, and commit state inconsistent across buffers; subsequent trace reads or commits can access wrong backing pages, constituting kernel-memory corruption with arbitrary-read potential.\nI:H - Mid-reservation buffer swap causes unlock_commit on the wrong cpu_buffer with mismatched tail/commit page pointers, corrupting ring-buffer page lists and write metadata in ways exploitable for heap corruption and control-flow manipulation.\nA:H - rb_end_commit() hits RB_WARN_ON triggering WARN_ON and disabling recording; corrupted ring-buffer page state from this swap race has caused kernel oops/panic in related ring_buffer_swap_cpu bugs, and panic_on_warn makes the WARN fatal."}]}], "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": "26662bc8fced1d668fa1aa146eda085bfc67bd0b", "status": "affected", "versionType": "git"}, {"version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990", "lessThan": "6b524e6b234e45c7f5f90d13b042c6f57f80105c", "status": "affected", "versionType": "git"}, {"version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990", "lessThan": "597f279b7b4a06412e3d965e98cc36e181cdbede", "status": "affected", "versionType": "git"}, {"version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990", "lessThan": "22709117d9ae95e52673685f98caac7c356a8227", "status": "affected", "versionType": "git"}, {"version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990", "lessThan": "ad7e10c7ea89af45ac1bf1814855d45da472703d", "status": "affected", "versionType": "git"}, {"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": "5.10.266", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.153", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.105", "lessThanOrEqual": "6.12.*", "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": "5.10.266"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "5.15.217"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.1.184"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.6.153"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.12.105"}, {"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/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"}}}}

{}

{"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": "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"}]}], "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": "2026-08-25T06:18:36.057", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-22T16:16:32.530", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/22709117d9ae95e52673685f98caac7c356a8227"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/26662bc8fced1d668fa1aa146eda085bfc67bd0b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/597f279b7b4a06412e3d965e98cc36e181cdbede"}, {"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/6b524e6b234e45c7f5f90d13b042c6f57f80105c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ad7e10c7ea89af45ac1bf1814855d45da472703d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f27bdc43077e4fcb5557dfc315ee8d91e741f483"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ring-buffer: Use current_context for safe per-CPU buffer swap", "id": "2521464", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521464"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nring-buffer: Use current_context for safe per-CPU buffer swap\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:\nring_buffer_lock_reserve\ncpu_buffer = buffer->buffers[cpu]; // cpu_buffer_a\nrb_reserve_next_event\nrb_start_commit // inc committing\nif (unlikely(READ_ONCE(cpu_buffer->buffer) != buffer)) {...}\n__rb_reserve_next\nrb_move_tail\nrb_end_commit(cpu_buffer); // dec committing => 0\n/* interrupt hits here, successfully swaps! */\nlocal_inc(&cpu_buffer->committing);\nring_buffer_unlock_commit\ncpu_buffer = buffer->buffers[cpu]; // cpu_buffer_b\nrb_commit\nrb_end_commit\nRB_WARN_ON(cpu_buffer, !local_read(&cpu_buffer->committing))\n// triggers warning\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().\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.", "A flaw was found in the Linux kernel's ring-buffer component. A race condition exists within the `ring_buffer_swap_cpu()` function, where a committing counter can temporarily drop to zero during a write operation. This allows a buffer swap to occur while a write is still in progress, resulting in an inconsistent buffer state. This inconsistency can lead to system instability and a denial of service."], "name": "CVE-2026-74601", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74601\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74601\nhttps://lore.kernel.org/linux-cve-announce/2026082215-CVE-2026-74601-7bba@gregkh/T"], "threat_severity": "Low"}

{"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": "2026-08-25T14:00:17.981106+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-367"]}