{"id":"CVE-2026-80738","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie\n\nbpf_tcp_gen_syncookie and bpf_tcp_check_syncookie accept a socket pointer\n'sk' with argument type ARG_PTR…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie\n\nbpf_tcp_gen_syncookie and bpf_tcp_check_syncookie accept a socket pointer\n'sk' with argument type ARG_PTR…","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","vendor":"Linux","product":"Linux","affected":["Linux >= 399040847084a69f345e0a52fd62f04654e0fce3 < 22c2169770ad3b3595690e51caac875178cf496d","Linux >= 399040847084a69f345e0a52fd62f04654e0fce3 < 23f682083aa3fbc0c49667818efd6979a8bc5ac2","Linux >= 399040847084a69f345e0a52fd62f04654e0fce3 < 31a420a822ff92e2090bd5d65efe8e34e2d6d9b8","Linux 5.2"],"published":"2026-09-03","updated":"2026-10-15","sourceUpdated":"2026-10-15T11:17:52.053","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80738","references":[{"url":"https://git.kernel.org/stable/c/22c2169770ad3b3595690e51caac875178cf496d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/23f682083aa3fbc0c49667818efd6979a8bc5ac2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/31a420a822ff92e2090bd5d65efe8e34e2d6d9b8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00162,"epssPercentile":0.04974,"ingestedAt":"2026-10-15T11:00:41.664Z","slug":"CVE-2026-80738","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie\n\nbpf_tcp_gen_syncookie and bpf_tcp_check_syncookie accept a socket pointer\n'sk' with argument type ARG_PTR_TO_BTF_ID_SOCK_COMMON. However, they access\nsk->sk_protocol without validating whether 'sk' represents a full socket.\n\nFix this issue by checking sk->sk_state != TCP_LISTEN before inspecting\nsk->sk_protocol in both bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie.\nSince mini-sockets are never in the TCP_LISTEN state, the condition\nshort-circuits and prevents dereferencing fullsock-specific fields.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}