tcp: clear sock_ops cb flags before force-closing a child socket
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: 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 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.
CVE-2026-74268
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74268
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d44874910a26f3a8f81edf873a2473363f07f660",
"lessThan": "5d5389b2c37ca00da61d1407618ebe15abae0c8b",
"versionType": "git"
},
{
"status": "affected",
"version": "d44874910a26f3a8f81edf873a2473363f07f660",
"lessThan": "9f30ba9aa0270a18fdd1e6cd426c480c35f7de9d",
"versionType": "git"
},
{
"status": "affected",
"version": "d44874910a26f3a8f81edf873a2473363f07f660",
"lessThan": "71e9c53220abd7f5a45aa4d5e5b420d3479f3a4f",
"versionType": "git"
},
{
"status": "affected",
"version": "d44874910a26f3a8f81edf873a2473363f07f660",
"lessThan": "9fffa6465851a1910a6e9cb7272787dd615b26b1",
"versionType": "git"
},
{
"status": "affected",
"version": "d44874910a26f3a8f81edf873a2473363f07f660",
"lessThan": "fe23d56e9266d58ba5c380f1970118eedeee0b68",
"versionType": "git"
},
{
"status": "affected",
"version": "d44874910a26f3a8f81edf873a2473363f07f660",
"lessThan": "ce311bd2e36596f0aa2c92ca86fb3e019ac57eae",
"versionType": "git"
},
{
"status": "affected",
"version": "d44874910a26f3a8f81edf873a2473363f07f660",
"lessThan": "8874dafc9099bc49c2e5ebba030f85d276421f92",
"versionType": "git"
},
{
"status": "affected",
"version": "d44874910a26f3a8f81edf873a2473363f07f660",
"lessThan": "990348e5bb457697c2f1f7f7b65154a3334d9d2b",
"versionType": "git"
}
],
"programFiles": [
"include/net/tcp.h",
"net/ipv4/inet_connection_sock.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/tcp.h",
"net/ipv4/inet_connection_sock.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74268
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #33074 · Revision 1
- Added to Heist Feed
- Publisher date