{"schema":"threatline.record/2","record":{"id":"CVE-2021-22600","aliases":[],"summary":"Linux Kernel Privilege Escalation Vulnerability","details":"Linux Kernel contains a flaw in the packet socket (AF_PACKET) implementation which could lead to incorrectly freeing memory. A local user could exploit this for denial-of-service (DoS) or possibly for privilege escalation.","categories":["Operating systems"],"product":"Kernel","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-22600","source_modified_at":"2025-10-21T23:15:48.681Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Kernel","vendor":"Linux Kernel","versions":[{"version":"unspecified","lessThan":"5.4.168","status":"affected","versionType":"custom"},{"version":"unspecified","lessThan":"5.10.88","status":"affected","versionType":"custom"},{"version":"unspecified","lessThan":"5.15.11","status":"affected","versionType":"custom"},{"version":"unspecified","lessThan":"5.16-rc6","status":"affected","versionType":"custom"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-22600","source_modified_at":"2025-10-21T23:15:48.681Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Kernel","ecosystem":null},"version":"5.4.168","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-22600","source_modified_at":"2025-10-21T23:15:48.681Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Kernel","ecosystem":null},"version":"5.10.88","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-22600","source_modified_at":"2025-10-21T23:15:48.681Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Kernel","ecosystem":null},"version":"5.15.11","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-22600","source_modified_at":"2025-10-21T23:15:48.681Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Kernel","ecosystem":null},"version":"5.16-rc6","basis":"first unaffected version stated in the CVE record"}],"cvss":6.6,"severity":"Medium","kev":{"listed":true,"date_added":"2022-04-11","due_date":"2022-05-02","required_action":"Apply updates per vendor instructions.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.06586,"percentile":0.93826,"score_date":"2026-10-23"},"published_at":"2022-01-26T00:00:00.000Z","modified_at":"2025-10-21T23:15:48.681Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2021-22600","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:15:48.681Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-22600","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22600","source":"CISA KEV"},{"source":"CVE List","url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755","tags":["x_transferred"]},{"source":"CVE List","url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html","tags":["mailing-list","x_transferred"]},{"source":"CVE List","url":"https://www.debian.org/security/2022/dsa-5096","tags":["vendor-advisory","x_transferred"]},{"source":"CVE List","url":"https://security.netapp.com/advisory/ntap-20230110-0002/","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22600","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"partial","assessed_at":"2025-01-29T20:47:54.395065Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"vendor and product","confidence":"heuristic","reviewed":false},"change_timestamp":"2025-10-21T23:15:48.681Z","content_hash":"94c7d3f8a6ca1cecfe979bd70511ad373112663ec2e041f0965a367ee6882fc2"}}