ghsa-jrxj-mm3c-m6gg
Vulnerability from github
Published
2024-02-27 21:31
Modified
2024-04-10 21:30
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Details

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

NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds

Fix shift out-of-bounds in xprt_calc_majortimeo(). This is caused by a garbage timeout (retrans) mount option being passed to nfs mount, in this case from syzkaller.

If the protocol is XPRT_TRANSPORT_UDP, then 'retrans' is a shift value for a 64-bit long integer, so 'retrans' cannot be >= 64. If it is >= 64, fail the mount and return an error.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-46952"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-27T19:04:06Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: fs_context: validate UDP retrans to prevent shift out-of-bounds\n\nFix shift out-of-bounds in xprt_calc_majortimeo(). This is caused\nby a garbage timeout (retrans) mount option being passed to nfs mount,\nin this case from syzkaller.\n\nIf the protocol is XPRT_TRANSPORT_UDP, then \u0027retrans\u0027 is a shift\nvalue for a 64-bit long integer, so \u0027retrans\u0027 cannot be \u003e= 64.\nIf it is \u003e= 64, fail the mount and return an error.",
  "id": "GHSA-jrxj-mm3c-m6gg",
  "modified": "2024-04-10T21:30:29Z",
  "published": "2024-02-27T21:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46952"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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