CVE-2026-74268

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

tcp: clear sock_ops cb flags before force-closing a child socket

A child socket inherits the listener's bpf_sock_ops_cb_flags via

sk_clone_lock(). If its setup fails in tcp_v4_syn_recv_sock() /

tcp_v6_syn_recv_sock(), the child is freed through put_and_exit, where

inet_csk_prepare_forced_close() drops the socket lock and tcp_done() runs

without it.

If BPF_SOCK_OPS_STATE_CB_FLAG was inherited, tcp_done() -> tcp_set_state()

calls tcp_call_bpf(), which expects the lock and trips sock_owned_by_me():

WARNING: include/net/sock.h:1799 at tcp_set_state+0x433/0x550

RIP: 0010:tcp_set_state+0x433/0x550 include/net/sock.h:1799

Call Trace:

<IRQ>

tcp_done+0xba/0x250 net/ipv4/tcp.c:5095

tcp_v4_syn_recv_sock+0x850/0xa50 net/ipv4/tcp_ipv4.c:1787

tcp_check_req+0xf30/0x1360 net/ipv4/tcp_minisocks.c:926

tcp_v4_rcv+0x1047/0x1b50 net/ipv4/tcp_ipv4.c:2164

</IRQ>

The child is freed before it is ever established, s

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References