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CVE PROGRAM SOURCE RECORD7.3 High

CVE-2026-80738

bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 399040847084a69f345e0a52fd62f04654e0fce3 to < b75f1c071f31be7f4b950721e04240c250091ad4affected
  • 399040847084a69f345e0a52fd62f04654e0fce3 to < 5702e4c259809c760912c477c4ae34e9217bb4d9affected
  • 399040847084a69f345e0a52fd62f04654e0fce3 to < b5525e853a2a08a9559adb84b0616025958dc542affected
  • 399040847084a69f345e0a52fd62f04654e0fce3 to < 22c2169770ad3b3595690e51caac875178cf496daffected
  • 399040847084a69f345e0a52fd62f04654e0fce3 to < 23f682083aa3fbc0c49667818efd6979a8bc5ac2affected
  • 399040847084a69f345e0a52fd62f04654e0fce3 to < 31a420a822ff92e2090bd5d65efe8e34e2d6d9b8affected

Linux Linux

Default version status: affected

  • 5.2affected
  • 0 to < 5.2unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.57 to ≤ 6.18.*unaffected
  • 7.1.9 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References