{"api_version":"1","generated_at":"2026-11-03T14:39:49+00:00","cve":"CVE-2026-99158","urls":{"html":"https://cve.report/CVE-2026-99158","api":"https://cve.report/api/cve/CVE-2026-99158.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99158","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99158"},"summary":{"title":"ring-buffer: Fix false warning in ring_buffer_map_get_reader()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix false warning in ring_buffer_map_get_reader()\n\nThe mmap reader can warn when it catches up with a writer that is still\ncommitting events. rb_get_reader_page() returns NULL in this case, but\nring_buffer_map_get_reader() treats that result as an error.\n\nThe initial rb_per_cpu_empty() check filters out an empty buffer, but it\ndoes not guarantee that the next reader page has committed data. Writers\ndo not take reader_lock and can advance commit_page before publishing the\ncommitted length on the new page. rb_get_reader_page() can swap to that\npage, catch up with the writer and return NULL.\n\nHandle NULL through the existing no-data exit without warning. Remove the\ncaller's reader_page == commit_page check as well, since the reader-page\nhelper already handles that case. The existing metadata update and return\npath remain in place.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-28 11:17:36","updated_at":"2026-10-30 13:21:49"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/029770f5badedc0f0ff85fc45e24785cbbee4a67","name":"https://git.kernel.org/stable/c/029770f5badedc0f0ff85fc45e24785cbbee4a67","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/68e6ab180cfb6dfa79652f41ed7899a6d4cf5438","name":"https://git.kernel.org/stable/c/68e6ab180cfb6dfa79652f41ed7899a6d4cf5438","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/32751946f9b3e502e3d6e42d98b343473112f887","name":"https://git.kernel.org/stable/c/32751946f9b3e502e3d6e42d98b343473112f887","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/89bab1dba8a0167ef0d819e0f55b6bafa038e87f","name":"https://git.kernel.org/stable/c/89bab1dba8a0167ef0d819e0f55b6bafa038e87f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99158","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99158","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 117c39200d9d760cbd5944bb89efb7b9c51965aa 32751946f9b3e502e3d6e42d98b343473112f887 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 117c39200d9d760cbd5944bb89efb7b9c51965aa 029770f5badedc0f0ff85fc45e24785cbbee4a67 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 117c39200d9d760cbd5944bb89efb7b9c51965aa 68e6ab180cfb6dfa79652f41ed7899a6d4cf5438 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 117c39200d9d760cbd5944bb89efb7b9c51965aa 89bab1dba8a0167ef0d819e0f55b6bafa038e87f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.10","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.115 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.59 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.13 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"99158","cve":"CVE-2026-99158","epss":"0.001680000","percentile":"0.061690000","score_date":"2026-11-01","updated_at":"2026-11-02 00:05:55"},"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":"32751946f9b3e502e3d6e42d98b343473112f887","status":"affected","version":"117c39200d9d760cbd5944bb89efb7b9c51965aa","versionType":"git"},{"lessThan":"029770f5badedc0f0ff85fc45e24785cbbee4a67","status":"affected","version":"117c39200d9d760cbd5944bb89efb7b9c51965aa","versionType":"git"},{"lessThan":"68e6ab180cfb6dfa79652f41ed7899a6d4cf5438","status":"affected","version":"117c39200d9d760cbd5944bb89efb7b9c51965aa","versionType":"git"},{"lessThan":"89bab1dba8a0167ef0d819e0f55b6bafa038e87f","status":"affected","version":"117c39200d9d760cbd5944bb89efb7b9c51965aa","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":"6.10"},{"lessThan":"6.10","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.115","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.59","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.115","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.59","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.13","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"6.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix false warning in ring_buffer_map_get_reader()\n\nThe mmap reader can warn when it catches up with a writer that is still\ncommitting events. rb_get_reader_page() returns NULL in this case, but\nring_buffer_map_get_reader() treats that result as an error.\n\nThe initial rb_per_cpu_empty() check filters out an empty buffer, but it\ndoes not guarantee that the next reader page has committed data. Writers\ndo not take reader_lock and can advance commit_page before publishing the\ncommitted length on the new page. rb_get_reader_page() can swap to that\npage, catch up with the writer and return NULL.\n\nHandle NULL through the existing no-data exit without warning. Remove the\ncaller's reader_page == commit_page check as well, since the reader-page\nhelper already handles that case. The existing metadata update and return\npath remain in place."}],"providerMetadata":{"dateUpdated":"2026-10-30T12:42:24.782Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/32751946f9b3e502e3d6e42d98b343473112f887"},{"url":"https://git.kernel.org/stable/c/029770f5badedc0f0ff85fc45e24785cbbee4a67"},{"url":"https://git.kernel.org/stable/c/68e6ab180cfb6dfa79652f41ed7899a6d4cf5438"},{"url":"https://git.kernel.org/stable/c/89bab1dba8a0167ef0d819e0f55b6bafa038e87f"}],"title":"ring-buffer: Fix false warning in ring_buffer_map_get_reader()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99158","datePublished":"2026-10-28T10:35:11.848Z","dateReserved":"2026-09-25T10:25:14.397Z","dateUpdated":"2026-10-30T12:42:24.782Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-28 11:17:36","lastModifiedDate":"2026-10-30 13:21:49","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99158","Ordinal":"1","Title":"ring-buffer: Fix false warning in ring_buffer_map_get_reader()","CVE":"CVE-2026-99158","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99158","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix false warning in ring_buffer_map_get_reader()\n\nThe mmap reader can warn when it catches up with a writer that is still\ncommitting events. rb_get_reader_page() returns NULL in this case, but\nring_buffer_map_get_reader() treats that result as an error.\n\nThe initial rb_per_cpu_empty() check filters out an empty buffer, but it\ndoes not guarantee that the next reader page has committed data. Writers\ndo not take reader_lock and can advance commit_page before publishing the\ncommitted length on the new page. rb_get_reader_page() can swap to that\npage, catch up with the writer and return NULL.\n\nHandle NULL through the existing no-data exit without warning. Remove the\ncaller's reader_page == commit_page check as well, since the reader-page\nhelper already handles that case. The existing metadata update and return\npath remain in place.","Type":"Description","Title":"ring-buffer: Fix false warning in ring_buffer_map_get_reader()"}]}}}