{"action":"Upgrade linux to 4.18.20-1 or later.","affected":[{"fixed":"4.18.20-1","introduced":"0"}],"component":"linux","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["4.18.20-1"],"id":"tcs_01M5ND83MG74MT7RZSERZPYAQC","modified_at":"2026-10-23T18:03:03.139694592Z","published_at":"2018-11-16T20:29:00.233Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2018-18955","https://security-tracker.debian.org/tracker/CVE-2018-18955"],"severity":{"label":"high","score":7},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2018-18955","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2018-18955"}],"summary":"In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ran"}