fkie_cve-2025-38112
Vulnerability from fkie_nvd
Published
2025-07-03 09:15
Modified
2025-07-03 15:13
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526da
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: Se solucion\u00f3 el problema de TOCTOU en sk_is_readable(). sk-\u0026gt;sk_prot-\u0026gt;sock_is_readable es un puntero a funci\u00f3n v\u00e1lido cuando sk reside en un mapa de sockets. Tras el \u00faltimo sk_psock_put() (que suele ocurrir al eliminar un socket de un mapa de sockets), sk-\u0026gt;sk_prot se restaura y sk-\u0026gt;sk_prot-\u0026gt;sock_is_readable se convierte en NULL. Esto hace que sk_is_readable() sea arriesgado si el valor de sk-\u0026gt;sk_prot se recarga despu\u00e9s de la comprobaci\u00f3n inicial. Esto, a su vez, puede provocar una desreferencia de puntero nulo. Aseg\u00farese de que el puntero a funci\u00f3n no se convierta en NULL despu\u00e9s de la comprobaci\u00f3n."
    }
  ],
  "id": "CVE-2025-38112",
  "lastModified": "2025-07-03T15:13:53.147",
  "metrics": {},
  "published": "2025-07-03T09:15:24.960",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526da"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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