CVE-2026-80738: Schwachstellen-Eintrag (NVD)
In the Linux kernel, the following vulnerability has been resolved:
bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie
bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie accept a socket pointer
'sk' with argument type ARG_PTR_TO_BTF_ID_SOCK_COMMON. However, they access
sk->sk_protocol without validating whether 'sk' represents a full socket.
Fix this issue by checking sk->sk_state != TCP_LISTEN before inspecting
sk->sk_protocol in both bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie.
Since mini-sockets are never in the TCP_LISTEN state, the condition
short-circuits and prevents dereferencing fullsock-specific fields.
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CVE-2026-80738 | Linux Kernel up to 7.1.8 BPF bpf_tcp_gen_syncookie/bpf_tcp_check_syncookie sk null pointer dereference
A vulnerability was found in Linux Kernel up to 7.1.8 and classified as problematic. Affected by this vulnerability is the function bpf_tcp_gen_syncookie/bpf_tcp_check_syncookie of the component BPF. Executing a manipulation of the argument