CVE-2026-72242
Description
In the Linux kernel, the following vulnerability has been resolved: selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() selinux_sctp_bind_connect() dereferences sk->sk_socket to pass a struct socket * to selinux_socket_bind() and selinux_socket_connect_helper(). However, when the hook is invoked from the ASCONF softirq path (sctp_process_asconf), there is no file reference guaranteeing that sk->sk_socket is non-NULL. The setsockopt callers (bindx, connectx, set_primary, sendmsg connect) hold a file reference and are not affected. Both selinux_socket_bind() and selinux_socket_connect_helper() immediately resolve sock->sk, never using the struct socket * for anything else. Refactor the inner logic into helpers that take a struct sock * directly so that selinux_sctp_bind_connect() never needs to touch sk->sk_socket at all.
How to fix
- Linux Linuxe4f3b8db1b0c5e9f6374b8996d9e1888d1042b55, 2fcaf133a8fd88b69f32ebaecad93fd302da828f, a4bc2fb8536488b37680c0b66c59434a4b7f8c2f, 5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4, cc8bd47b35eca82393cbad08b1cc86f02e034439, d61a80b17254be7230bc5544f8e62ddf21ab38e2, 37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb, 56acfeb10019e200ab6787d01f8d7cbe0f01526f or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | d452930fd3b9031e59abfeddb2fa383f1403d61a ≤ v < e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55, d452930fd3b9031e59abfeddb2fa383f1403d61a ≤ v < 2fcaf133a8fd88b69f32ebaecad93fd302da828f, d452930fd3b9031e59abfeddb2fa383f1403d61a ≤ v < a4bc2fb8536488b37680c0b66c59434a4b7f8c2f, d452930fd3b9031e59abfeddb2fa383f1403d61a ≤ v < 5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4, d452930fd3b9031e59abfeddb2fa383f1403d61a ≤ v < cc8bd47b35eca82393cbad08b1cc86f02e034439, d452930fd3b9031e59abfeddb2fa383f1403d61a ≤ v < d61a80b17254be7230bc5544f8e62ddf21ab38e2, d452930fd3b9031e59abfeddb2fa383f1403d61a ≤ v < 37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb, d452930fd3b9031e59abfeddb2fa383f1403d61a ≤ v < 56acfeb10019e200ab6787d01f8d7cbe0f01526f, 4.17 | e4f3b8db1b0c5e9f6374b8996d9e1888d1042b55, 2fcaf133a8fd88b69f32ebaecad93fd302da828f, a4bc2fb8536488b37680c0b66c59434a4b7f8c2f, 5d4d93f9bfbc997ffbb03cd6107e8f6979dbb9b4, cc8bd47b35eca82393cbad08b1cc86f02e034439, d61a80b17254be7230bc5544f8e62ddf21ab38e2, 37d642b37ccdc31e1947c2ebc8dc38f03d4a0ceb, 56acfeb10019e200ab6787d01f8d7cbe0f01526f |
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