{"cve":"CVE-2026-80738","nvd":{"published":"2026-09-03T13:06:12.910","modified":"2026-10-21T13:19:59.450","status":"Received","description":"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_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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","score":7.3},"cwes":[],"references":["https://git.kernel.org/stable/c/22c2169770ad3b3595690e51caac875178cf496d","https://git.kernel.org/stable/c/23f682083aa3fbc0c49667818efd6979a8bc5ac2","https://git.kernel.org/stable/c/31a420a822ff92e2090bd5d65efe8e34e2d6d9b8","https://git.kernel.org/stable/c/5702e4c259809c760912c477c4ae34e9217bb4d9","https://git.kernel.org/stable/c/b5525e853a2a08a9559adb84b0616025958dc542"],"products":[],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-80738","score":0.00171,"percentile":0.06416,"date":"2026-10-26"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}