{"action":"Upgrade linux to 6.12.20-1 or later.","affected":[{"fixed":"6.12.20-1","introduced":"0"}],"component":"linux","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["6.12.20-1"],"id":"tcs_01M5NN3VAVZYSD5ZNSC3SPWPJR","modified_at":"2026-10-16T09:47:23.309768626Z","published_at":"2025-04-01T16:15:28.440Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2025-21971","https://security-tracker.debian.org/tracker/CVE-2025-21971"],"severity":{"label":"medium","score":5.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2025-21971#Debian:13/linux","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2025-21971"}],"summary":"In the Linux kernel, the following vulnerability has been resolved: net_sched: Prevent creation of classes with TC_H_ROOT The function qdisc_tree_reduce_backlog() uses TC_H_ROOT as a termination condi"}