CVE-2026-80738

HighCVSS 7.3/10Last modified Oct 30, 2026

Description

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.

Metrics

CVSS 3.1 7.3/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 399040847084a69f345e0a52fd62f04654e0fce3, < b75f1c071f31be7f4b950721e04240c250091ad4; >= 399040847084a69f345e0a52fd62f04654e0fce3, < 5702e4c259809c760912c477c4ae34e9217bb4d9; >= 399040847084a69f345e0a52fd62f04654e0fce3, < b5525e853a2a08a9559adb84b0616025958dc542; >= 399040847084a69f345e0a52fd62f04654e0fce3, < 22c2169770ad3b3595690e51caac875178cf496d; >= 399040847084a69f345e0a52fd62f04654e0fce3, < 23f682083aa3fbc0c49667818efd6979a8bc5ac2; >= 399040847084a69f345e0a52fd62f04654e0fce3, < 31a420a822ff92e2090bd5d65efe8e34e2d6d9b8
LinuxLinux5.2

References

Timeline

Published
Sep 3, 2026
Last modified
Oct 30, 2026
NVD status
Received

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CVE-2026-80738: High severity, CVSS 7.3 | Vulnix