{"schema":"threatline.record/2","record":{"id":"CVE-2026-58099","aliases":[],"summary":"Memory safety bugs in kqueue copy-on-fork implementation","details":"When copying knotes from a parent kqueue to a child, the copy code did not correctly exclude marker knotes (used internally to track list traversal position) before marking them as in-flux and releasing the kqueue lock.  If another thread freed a marker while the lock was dropped, the subsequent in-flux decrement operated on freed memory.\n\nAn unprivileged local user may be able to exploit these races to escalate privileges.","categories":["Operating systems"],"product":"FreeBSD","vendor":"FreeBSD","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-58099","source_modified_at":"2026-10-19T14:10:47.179Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"FreeBSD","vendor":"FreeBSD","versions":[{"status":"affected","versionType":"release","version":"15.1-RELEASE","lessThan":"p4"}],"defaultStatus":"unknown"}],"fixed_versions":[],"cvss":7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00096,"percentile":0.00677,"score_date":"2026-10-23"},"published_at":"2026-10-15T06:31:18.042Z","modified_at":"2026-10-19T14:10:47.179Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-58099","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T14:10:47.179Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-58099","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:65.kqueue.asc","tags":["vendor-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-16T03:56:54.101667Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T14:10:47.179Z","content_hash":"a3a0e70e0d35639d16da66d0146b49b25f04a36108d727a7ee12f8645c2e8afd"}}