{"action":"Upgrade linux to 5.15.5-1 or later.","affected":[{"fixed":"5.15.5-1","introduced":"0"}],"component":"linux","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["5.15.5-1"],"id":"tcs_01M5NFYMSFXAZPQMD8353WKEW0","modified_at":"2026-10-09T09:47:24.773115603Z","published_at":"2022-01-21T19:15:09.703Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-4001","https://security-tracker.debian.org/tracker/CVE-2021-4001"],"severity":{"label":"medium","score":4.1},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-4001","url":"https://osv.dev/vulnerability/DEBIAN-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 p"}