ghsa-65x6-qq63-m88g
Vulnerability from github
Published
2024-02-28 09:30
Modified
2024-12-09 18:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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

RDMA/siw: Fix a use after free in siw_alloc_mr

Our code analyzer reported a UAF.

In siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of siw_mr_add_mem(), mem is assigned to mr->mem and then mem is freed via kfree(mem) if xa_alloc_cyclic() failed. Here, mr->mem still point to a freed object. After, the execution continue up to the err_out branch of siw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr).

My patch moves "mr->mem = mem" behind the if (xa_alloc_cyclic(..)<0) {} section, to avoid the uaf.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47012"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-28T09:15:38Z",
    "severity": "HIGH"
  },
  "details": "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-\u003emem and then mem is freed via\nkfree(mem) if xa_alloc_cyclic() failed. Here, mr-\u003emem still point to a\nfreed object. After, the execution continue up to the err_out branch of\nsiw_alloc_mr, and the freed mr-\u003emem is used in siw_mr_drop_mem(mr).\n\nMy patch moves \"mr-\u003emem = mem\" behind the if (xa_alloc_cyclic(..)\u003c0) {}\nsection, to avoid the uaf.",
  "id": "GHSA-65x6-qq63-m88g",
  "modified": "2024-12-09T18:31:18Z",
  "published": "2024-02-28T09:30:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47012"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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