CVE-2026-80738
HIGH
MEDIUM
Priority: 0.01
BB Relevance:
40/100
Published: 2026-09-03
Modified: 2026-10-30
First seen: 2026-10-30
Status: active
Attack Surface
Low Complexity
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
High
I:
High
A:
Low
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 Software (7)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | 399040847084a69f345e0a52fd62f04654e0fce3 < b75f1c071f31be7f4b950721e04240c250091ad4 |
| Linux | Linux | 399040847084a69f345e0a52fd62f04654e0fce3 < 5702e4c259809c760912c477c4ae34e9217bb4d9 |
| Linux | Linux | 399040847084a69f345e0a52fd62f04654e0fce3 < b5525e853a2a08a9559adb84b0616025958dc542 |
| Linux | Linux | 399040847084a69f345e0a52fd62f04654e0fce3 < 22c2169770ad3b3595690e51caac875178cf496d |
| Linux | Linux | 399040847084a69f345e0a52fd62f04654e0fce3 < 23f682083aa3fbc0c49667818efd6979a8bc5ac2 |
| Linux | Linux | 399040847084a69f345e0a52fd62f04654e0fce3 < 31a420a822ff92e2090bd5d65efe8e34e2d6d9b8 |
| Linux | Linux | 5.2 |