Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 399040847084a69f345e0a52fd62f04654e0fce3 before 5702e4c259809c760912c477c4ae34e9217bb4d9; affected 399040847084a69f345e0a52fd62f04654e0fce3 before b5525e853a2a08a9559adb84b0616025958dc542; affected 399040847084a69f345e0a52fd62f04654e0fce3 before 22c2169770ad3b3595690e51caac875178cf496d; affected 399040847084a69f345e0a52fd62f04654e0fce3 before 23f682083aa3fbc0c49667818efd6979a8bc5ac2; affected 399040847084a69f345e0a52fd62f04654e0fce3 before 31a420a822ff92e2090bd5d65efe8e34e2d6d9b8 |
| Linux / Linux | affected 5.2; unaffected 0 before 5.2; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.1.9 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/5702e4c259809c760912c477c4ae34e9217bb4d9
- https://git.kernel.org/stable/c/b5525e853a2a08a9559adb84b0616025958dc542
- https://git.kernel.org/stable/c/22c2169770ad3b3595690e51caac875178cf496d
- https://git.kernel.org/stable/c/23f682083aa3fbc0c49667818efd6979a8bc5ac2
- https://git.kernel.org/stable/c/31a420a822ff92e2090bd5d65efe8e34e2d6d9b8