ghsa-4mp8-c9w5-ff64
Vulnerability from github
Published
2025-07-03 09:30
Modified
2025-11-03 18:31
Details

In the Linux kernel, the following vulnerability has been resolved:

net: Fix TOCTOU issue in sk_is_readable()

sk->sk_prot->sock_is_readable is a valid function pointer when sk resides in a sockmap. After the last sk_psock_put() (which usually happens when socket is removed from sockmap), sk->sk_prot gets restored and sk->sk_prot->sock_is_readable becomes NULL.

This makes sk_is_readable() racy, if the value of sk->sk_prot is reloaded after the initial check. Which in turn may lead to a null pointer dereference.

Ensure the function pointer does not turn NULL after the check.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38112"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-03T09:15:24Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Fix TOCTOU issue in sk_is_readable()\n\nsk-\u003esk_prot-\u003esock_is_readable is a valid function pointer when sk resides\nin a sockmap. After the last sk_psock_put() (which usually happens when\nsocket is removed from sockmap), sk-\u003esk_prot gets restored and\nsk-\u003esk_prot-\u003esock_is_readable becomes NULL.\n\nThis makes sk_is_readable() racy, if the value of sk-\u003esk_prot is reloaded\nafter the initial check. Which in turn may lead to a null pointer\ndereference.\n\nEnsure the function pointer does not turn NULL after the check.",
  "id": "GHSA-4mp8-c9w5-ff64",
  "modified": "2025-11-03T18:31:20Z",
  "published": "2025-07-03T09:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38112"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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