{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38618",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38618"
  ],
  "published": "2025-08-22T13:01:30Z",
  "summary": "vsock: Do not allow binding to VMADDR_PORT_ANY",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: Do not allow binding to VMADDR_PORT_ANY\n\nIt is possible for a vsock to autobind to VMADDR_PORT_ANY. This can\ncause a use-after-free when a connection is made to the bound socket.\nThe socket returned by accept() also has port VMADDR_PORT_ANY but is not\non the list of unbound sockets. Binding it will result in an extra\nrefcount decrement similar to the one fixed in fcdd2242c023 (vsock: Keep\nthe binding until socket destruction).\n\nModify the check in __vsock_bind_connectible() to also prevent binding\nto VMADDR_PORT_ANY.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38618"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c04a2c1ca25b9b23104124d3b2d349d934e302de"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d1a5b1964cef42727668ac0d8532dae4f8c19386"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cf86704798c1b9c46fa59dfc2d662f57d1394d79"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f138be5d7f301fddad4e65ec66dfc3ceebf79be3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/44bd006d5c93f6a8f28b106cbae2428c5d0275b7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/32950b1907919be86a7a2697d6f93d57068b3865"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8f01093646b49f6330bb2d36761983fd829472b1"
    },
    {
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      "url": "https://git.kernel.org/stable/c/d73960f0cf03ef1dc9e96ec7a20e538accc26d87"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aba0c94f61ec05315fa7815d21aefa4c87f6a9f4"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is triggered through the bind() syscall on an AF_VSOCK socket; vsock is a local socket interface with no remote network reachability, so the attacker needs local system access.\nAC:L - The accept()-based trigger is fully deterministic \u2014 create a loopback vsock listener, connect, accept, then bind the accepted socket to VMADDR_PORT_ANY to force the extra sock_put; no race or uncontrolled condition is required.\nPR:L - Any unprivileged local user can create AF_VSOCK sockets and use the loopback (VMADDR_CID_LOCAL) transport; the autobind path performs no capability check, so only basic user privileges are needed.\nUI:N - The entire sequence is performed by the attacker's own process via syscalls; no action by any other user is required.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority and does not cross a VM/hypervisor or IOMMU boundary.\nC:H - A use-after-free of the struct sock lets the attacker reclaim the freed object with controlled data, enabling arbitrary kernel memory disclosure.\nI:H - The UAF/refcount underflow enables heap grooming and write primitives over the reclaimed object, permitting kernel memory modification and potential control-flow hijack.\nA:H - The refcount underflow frees a still-referenced socket, causing use-after-free access that reliably crashes/panics the kernel."
    }
  }
}