{"action":"Upgrade linux to 6.1.158-1 or later.","affected":[{"fixed":"6.1.158-1","introduced":"0"}],"component":"linux","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["6.1.158-1"],"id":"tcs_01M5NNQMZASCX88SAV7WPZEMYV","modified_at":"2026-10-23T18:04:35.351244672Z","published_at":"2025-10-09T10:15:36.220Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2025-39955","https://security-tracker.debian.org/tracker/CVE-2025-39955"],"severity":{"label":"high","score":7.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2025-39955","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2025-39955"}],"summary":"In the Linux kernel, the following vulnerability has been resolved: tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect(). syzbot reported the splat below where a socket had tcp_sk(sk)->fastopen_rsk"}