{"id":"CVE-2026-99158","aliases":[],"title":"ring-buffer: Fix false warning in ring_buffer_map_get_reader()","titleSource":"Linux","descriptionSource":"Linux","products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"117c39200d9d760cbd5944bb89efb7b9c51965aa","status":"affected","lessThan":"029770f5badedc0f0ff85fc45e24785cbbee4a67","versionType":"git"},{"version":"117c39200d9d760cbd5944bb89efb7b9c51965aa","status":"affected","lessThan":"68e6ab180cfb6dfa79652f41ed7899a6d4cf5438","versionType":"git"},{"version":"117c39200d9d760cbd5944bb89efb7b9c51965aa","status":"affected","lessThan":"89bab1dba8a0167ef0d819e0f55b6bafa038e87f","versionType":"git"}],"defaultStatus":"unaffected","source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99158"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99158"}],"remediation":[],"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place.","severity":"unknown","score":null,"published":"2026-10-28T10:35:11.848Z","modified":"2026-10-28T10:35:11.848Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://git.kernel.org/stable/c/029770f5badedc0f0ff85fc45e24785cbbee4a67","https://git.kernel.org/stable/c/68e6ab180cfb6dfa79652f41ed7899a6d4cf5438","https://git.kernel.org/stable/c/89bab1dba8a0167ef0d819e0f55b6bafa038e87f"],"sources":[{"name":"CVE","id":"CVE-2026-99158","modified":"2026-10-28T10:35:11.848Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-99158"}],"assessments":[],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T03:15:31.428Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}