{
  "id": "CVE-2021-47012",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-02-28T09:15:38.753",
  "lastModified": "2024-02-28T14:06:45.783",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Fix a use after free in siw_alloc_mr\n\nOur code analyzer reported a UAF.\n\nIn siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of\nsiw_mr_add_mem(), mem is assigned to mr->mem and then mem is freed via\nkfree(mem) if xa_alloc_cyclic() failed. Here, mr->mem still point to a\nfreed object. After, the execution continue up to the err_out branch of\nsiw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr).\n\nMy patch moves \"mr->mem = mem\" behind the if (xa_alloc_cyclic(..)<0) {}\nsection, to avoid the uaf."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: RDMA/siw: Corrige un use after free en siw_alloc_mr Nuestro analizador de c\u00f3digo inform\u00f3 un UAF. En siw_alloc_mr(), llama a siw_mr_add_mem(mr,..). En la implementaci\u00f3n de siw_mr_add_mem(), mem se asigna a mr-&gt;mem y luego mem se libera mediante kfree(mem) si xa_alloc_ciclic() falla. Aqu\u00ed, mr-&gt;mem todav\u00eda apunta a un objeto liberado. Despu\u00e9s, la ejecuci\u00f3n contin\u00faa hasta la rama err_out de siw_alloc_mr, y el mr-&gt;mem liberado se usa en siw_mr_drop_mem(mr). Mi parche mueve \"mr-&gt;mem = mem\" detr\u00e1s de la secci\u00f3n if (xa_alloc_ciclic(..)&lt;0) {}, para evitar el uaf."
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}