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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74268
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:26 UTC
Updated2026-08-15 06:22:26 UTC
DescriptionIn 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, so it should run no sock_ops callback. Clear its cb flags in inet_csk_prepare_for_destroy_sock(), the common point for the IPv4, IPv6 and chtls forced-close paths and for the MPTCP ->syn_recv_sock() failure path (dispose_child), which reaches tcp_done() on a child that was never established too.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d44874910a26f3a8f81edf873a2473363f07f660 ce311bd2e36596f0aa2c92ca86fb3e019ac57eae git Not specified
CNA Linux Linux affected d44874910a26f3a8f81edf873a2473363f07f660 8874dafc9099bc49c2e5ebba030f85d276421f92 git Not specified
CNA Linux Linux affected d44874910a26f3a8f81edf873a2473363f07f660 990348e5bb457697c2f1f7f7b65154a3334d9d2b git Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8874dafc9099bc49c2e5ebba030f85d276421f92 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ce311bd2e36596f0aa2c92ca86fb3e019ac57eae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/990348e5bb457697c2f1f7f7b65154a3334d9d2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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