CVE-2026-80738

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.

Package Linux Kernel
Published 2026-09-03
Last modified 2026-09-03
Patch available
Yes

Affected versions

Linux kernel versions 5.2 and later are affected. Fixed in 7.1.9, 7.2 and their respective stable series.

Affected from
≥ 5.2
Fixed in
✓ 7.1.9 7.1.x ✓ 7.2

References

2 total

Frequently asked questions

  • What is CVE-2026-80738?

    CVE-2026-80738 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.2 onward and has been patched in 7.1.9 and 7.2. CVE-2026-80738 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • Is there a patch available for CVE-2026-80738?

    Yes. CVE-2026-80738 has been patched. Fixed versions include 7.1.9 and 7.2. If you are running Linux kernel 5.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-80738 actively exploited?

    No. CVE-2026-80738 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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