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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

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
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