{"action":"Upgrade linux to 6.12.21-1 or later.","affected":[{"fixed":"6.12.21-1","introduced":"0"}],"component":"linux","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["6.12.21-1"],"id":"tcs_01M5NN2Y0DFHD3M91F987XTA98","modified_at":"2026-09-01T20:05:42.917677968Z","published_at":"2025-03-31T20:15:14.613Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2025-21893","https://security-tracker.debian.org/tracker/CVE-2025-21893"],"severity":{"label":"high","score":7.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2025-21893#Debian:14/linux","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2025-21893"}],"summary":"In the Linux kernel, the following vulnerability has been resolved: keys: Fix UAF in key_put() Once a key's reference count has been reduced to 0, the garbage collector thread may destroy it at any ti"}