{
  "cveId": "CVE-2026-45918",
  "url": "https://patchblox.com/security/cve/CVE-2026-45918",
  "summary": "CVE-2026-45918 is fixed in 23 products on 1 platform, first by ALAS2023-2026-1514, released March 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ovpn: tcp - don\u0027t deref NULL sk_socket member af...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ovpn: tcp - don\u0027t deref NULL sk_socket member after tcp_close()  When deleting a peer in case of keepalive expiration, the peer is removed from the OpenVPN hashtable and is temporary inserted in a \u0022release list\u0022 for further processing.  This happens in: ovpn_peer_keepalive_work()   unlock_ovpn(release_list)  This processing includes detaching from the socket being used to talk to this peer, by restoring its original proto and socket ops/callbacks.  In case of TCP it may happen that, while the peer is sitting in the release list, userspace decides to close the socket. This will result in a concurrent execution of:  tcp_close(sk)   __tcp_close(sk)     sock_orphan(sk)       sk_set_socket(sk, NULL)  The last function call will set sk-\u003Esk_socket to NULL.  When the releasing routine is resumed, ovpn_tcp_socket_detach() will attempt to dereference sk-\u003Esk_socket to restore its original ops member. This operation will crash due to sk-\u003Esk_socket being NULL.  Fix this race condition by testing-and-accessing sk-\u003Esk_socket atomically under sk-\u003Esk_callback_lock.",
  "published": "2026-03-30T09:00:00Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00163,
  "epssPercentile": 0.05565,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.18.15-14.217",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-libbpf",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-libbpf-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-libbpf-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-libbpf-static",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.18.14-1",
      "fix": "DEBIAN-CVE-2026-45918",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-45918",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.15-14.217.amzn2023",
      "fix": "ALAS2023-2026-1514",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1514",
      "released": "2026-03-30T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}