fkie_cve-2022-50043
Vulnerability from fkie_nvd
Published
2025-06-18 11:15
Modified
2025-06-18 13:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: fix potential refcount leak in ndisc_router_discovery() The issue happens on specific paths in the function. After both the object `rt` and `neigh` are grabbed successfully, when `lifetime` is nonzero but the metric needs change, the function just deletes the route and set `rt` to NULL. Then, it may try grabbing `rt` and `neigh` again if above conditions hold. The function simply overwrite `neigh` if succeeds or returns if fails, without decreasing the reference count of previous `neigh`. This may result in memory leaks. Fix it by decrementing the reference count of `neigh` in place.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7396ba87f1edf549284869451665c7c4e74ecd4f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7998043d31d000c3a93f46182e6569dd0eecda34
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ffb15594433391fd7885eb88ce5a7f7bdeefbb15
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 potential refcount leak in ndisc_router_discovery()\n\nThe issue happens on specific paths in the function. After both the\nobject `rt` and `neigh` are grabbed successfully, when `lifetime` is\nnonzero but the metric needs change, the function just deletes the\nroute and set `rt` to NULL. Then, it may try grabbing `rt` and `neigh`\nagain if above conditions hold. The function simply overwrite `neigh`\nif succeeds or returns if fails, without decreasing the reference\ncount of previous `neigh`. This may result in memory leaks.\n\nFix it by decrementing the reference count of `neigh` in place."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: correcci\u00f3n de una posible fuga de referencias en ndisc_router_discovery(). El problema se produce en rutas espec\u00edficas de la funci\u00f3n. Tras la captura correcta de los objetos `rt` y `neigh`, cuando `lifetime` es distinto de cero pero la m\u00e9trica necesita cambiar, la funci\u00f3n simplemente elimina la ruta y establece `rt` en NULL. A continuaci\u00f3n, puede intentar capturar `rt` y `neigh` de nuevo si se cumplen las condiciones anteriores. La funci\u00f3n simplemente sobrescribe `neigh` si tiene \u00e9xito o retorna si falla, sin reducir la cantidad de referencias de `neigh` anterior. Esto puede provocar fugas de memoria. Para solucionarlo, reduzca la cantidad de referencias de `neigh` en su lugar."
    }
  ],
  "id": "CVE-2022-50043",
  "lastModified": "2025-06-18T13:47:40.833",
  "metrics": {},
  "published": "2025-06-18T11:15:32.787",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7396ba87f1edf549284869451665c7c4e74ecd4f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7998043d31d000c3a93f46182e6569dd0eecda34"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ffb15594433391fd7885eb88ce5a7f7bdeefbb15"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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