{"action":"Upgrade linux to 4.19.9-1 or later.","affected":[{"fixed":"4.19.9-1","introduced":"0"}],"component":"linux","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["4.19.9-1"],"id":"tcs_01M5ND77AHNXYT2Z3HQH4GMSNW","modified_at":"2026-10-23T18:03:02.337568643Z","published_at":"2018-12-12T10:29:00.240Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2018-18397","https://security-tracker.debian.org/tracker/CVE-2018-18397"],"severity":{"label":"medium","score":5.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2018-18397#Debian:14/linux","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2018-18397"}],"summary":"The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs"}