{"action":"Upgrade linux to 6.12.105-1 or later.","affected":[{"fixed":"6.12.105-1","introduced":"0"}],"component":"linux","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["6.12.105-1"],"id":"tcs_01M5NVPTNQNSCTR2HXHP245PM6","modified_at":"2026-10-23T18:04:42.126989279Z","published_at":"2026-08-26T15:17:14.750Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-80585","https://security-tracker.debian.org/tracker/CVE-2026-80585"],"severity":{"label":"critical","score":9.4},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-80585","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-80585"}],"summary":"In the Linux kernel, the following vulnerability has been resolved: mptcp: fastopen: only mark MPTFO subflows with SYN data Passive TCP Fast Open accepts a valid-cookie SYN even when it carries no dat"}