{"schema_version":"1","data":[{"id":1419,"advisory_id":"04d42968-d906-4b12-a5cf-7e969079959c","revision":1,"source_id":"core-kev","source_url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-3493","source_published_at":"2022-10-20T00:00:00+00:00","published_at":"2026-10-24T21:02:17.968585+00:00","extraction_method":"structured","technologies":["core-kev","kernel"],"cve_ids":["CVE-2021-3493"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"Linux Kernel Privilege Escalation Vulnerability","summary":"The overlayfs stacking file system in Linux kernel does not properly validate the application of file capabilities against user namespaces, which could lead to privilege escalation. CISA required action: Apply updates per vendor instructions.","evidence":"kev:CVE-2021-3493","products":[{"name":{"value":"Kernel","evidence":"/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"unknown","structured":{"id":"CVE-2021-3493","aliases":["CVE-2021-3493"],"affected":[],"modified":"2022-10-20T00:00:00.000Z","provider":"kev","references":["https://www.cisa.gov/known-exploited-vulnerabilities-catalog"],"exploitation":{"cwes":["CWE-862"],"cveID":"CVE-2021-3493","notes":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7c03e2cda4a584cadc398e8f6641ca9988a39d52; https://nvd.nist.gov/vuln/detail/CVE-2021-3493","dueDate":"2022-11-10","product":"Kernel","dateAdded":"2022-10-20","vendorProject":"Linux","requiredAction":"Apply updates per vendor instructions.","known_exploited":true,"shortDescription":"The overlayfs stacking file system in Linux kernel does not properly validate the application of file capabilities against user namespaces, which could lead to privilege escalation.","vulnerabilityName":"Linux Kernel Privilege Escalation Vulnerability","knownRansomwareCampaignUse":"Unknown"}},"related_cves":[{"value":"CVE-2021-3493","evidence":"/cveID"}],"security_relevant":true,"severity_evidence":null},"priority":{"reasons":["known_exploited"],"severity":"unknown","linked_cves":[],"fix_available":false,"known_exploited":true,"publisher_severity":"unknown"},"context_update":false}],"next_after":1419,"next_before":1419}