{"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_01M5NN3XRB4XT3X8CJMMAF2GA2","modified_at":"2026-09-01T20:05:43.292288206Z","published_at":"2025-04-01T16:15:29.077Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2025-21977","https://security-tracker.debian.org/tracker/CVE-2025-21977"],"severity":{"label":"medium","score":5.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2025-21977","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2025-21977"}],"summary":"In the Linux kernel, the following vulnerability has been resolved: fbdev: hyperv_fb: Fix hang in kdump kernel when on Hyper-V Gen 2 VMs Gen 2 Hyper-V VMs boot via EFI and have a standard EFI framebuf"}