{"schema_version":"1","data":[{"id":15869,"advisory_id":"c1e79abf-bd4b-4b34-b278-e3abb2da7f77","revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-4001","source_published_at":"2022-01-21T00:00:00+00:00","published_at":"2026-10-25T01:07:03.887693+00:00","extraction_method":"structured","technologies":["core-cve","kernel"],"cve_ids":["CVE-2021-4001"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"CVE-2021-4001","summary":"A race condition was found in the Linux kernel's ebpf verifier between bpf_map_update_elem and bpf_map_freeze due to a missing lock in kernel/bpf/syscall.c. In this flaw, a local user with a special privilege (cap_sys_admin or cap_bpf) can modify the frozen mapped address space. This flaw affects kernel versions prior to 5.16 rc2.","evidence":"cve:CVE-2021-4001","products":[{"name":{"value":"kernel","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"unknown","structured":{"id":"CVE-2021-4001","aliases":["CVE-2021-4001"],"metrics":[],"affected":[{"vendor":"n/a","product":"kernel","versions":[{"status":"affected","version":"kernel 5.16 rc2"}]}],"modified":"2026-10-08T21:03:26.368Z","provider":"cve","references":["https://bugzilla.redhat.com/show_bug.cgi?id=2025645","https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53"],"provider_metadata":{"adp":[{"title":"CVE Program Container","references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2025645","tags":["x_transferred"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53","tags":["x_transferred"]}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-03T17:16:03.566Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-4001","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-08T21:00:08.810482Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-08T21:03:26.368Z"}}],"cna":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2022-10-07T00:00:00.000Z"}}},"related_cves":[{"value":"CVE-2021-4001","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":null}}],"next_after":15869,"next_before":15869}