{"action":"Upgrade linux-6.12 to 6.12.107-1~deb12u1 or later.","affected":[{"fixed":"6.12.107-1~deb12u1","introduced":"0"}],"component":"linux-6.12","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["6.12.107-1~deb12u1"],"id":"tcs_01M5NVPTWX3AHPZXE9Y6RGS65N","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#Debian:12/linux-6.12","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"}