Answer in brief
CVE-2026-74268 records a Critical severity (CVSS 9.8) vulnerability in tcp: clear sock_ops cb flags before force-closing a child socket. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d44874910a26f3a8f81edf873a2473363f07f660 <ce311bd2e36596f0aa2c92ca86fb3e019ac57eae || >=d44874910a26f3a8f81edf873a2473363f07f660 <8874dafc9099bc49c2e5ebba030f85d276421f92 || >=d44874910a26f3a8f81edf873a2473363f07f660 <990348e5bb457697c2f1f7f7b65154a3334d9d2b | ce311bd2e36596f0aa2c92ca86fb3e019ac57eae, 8874dafc9099bc49c2e5ebba030f85d276421f92, 990348e5bb457697c2f1f7f7b65154a3334d9d2b |
| Linux/Linuxgeneric | 4.16 | Not reported |
| Linux/Linuxgeneric | >=d44874910a26f3a8f81edf873a2473363f07f660 <5d5389b2c37ca00da61d1407618ebe15abae0c8b || >=d44874910a26f3a8f81edf873a2473363f07f660 <9f30ba9aa0270a18fdd1e6cd426c480c35f7de9d || >=d44874910a26f3a8f81edf873a2473363f07f660 <71e9c53220abd7f5a45aa4d5e5b420d3479f3a4f || >=d44874910a26f3a8f81edf873a2473363f07f660 <9fffa6465851a1910a6e9cb7272787dd615b26b1 || >=d44874910a26f3a8f81edf873a2473363f07f660 <fe23d56e9266d58ba5c380f1970118eedeee0b68 || >=d44874910a26f3a8f81edf873a2473363f07f660 <ce311bd2e36596f0aa2c92ca86fb3e019ac57eae || >=d44874910a26f3a8f81edf873a2473363f07f660 <8874dafc9099bc49c2e5ebba030f85d276421f92 || >=d44874910a26f3a8f81edf873a2473363f07f660 <990348e5bb457697c2f1f7f7b65154a3334d9d2b | 5d5389b2c37ca00da61d1407618ebe15abae0c8b, 9f30ba9aa0270a18fdd1e6cd426c480c35f7de9d, 71e9c53220abd7f5a45aa4d5e5b420d3479f3a4f, 9fffa6465851a1910a6e9cb7272787dd615b26b1, fe23d56e9266d58ba5c380f1970118eedeee0b68, ce311bd2e36596f0aa2c92ca86fb3e019ac57eae, 8874dafc9099bc49c2e5ebba030f85d276421f92, 990348e5bb457697c2f1f7f7b65154a3334d9d2b |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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, 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.
Quoted source text, attributed separately from HOL analysis.