ghsa-x95x-w6hq-mwxc
Vulnerability from github
Published
2024-05-21 15:31
Modified
2024-12-24 18:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

nfsd: fix NULL dereference in nfs3svc_encode_getaclres

In error cases the dentry may be NULL.

Before 20798dfe249a, the encoder also checked dentry and d_really_is_positive(dentry), but that looks like overkill to me--zero status should be enough to guarantee a positive dentry.

This isn't the first time we've seen an error-case NULL dereference hidden in the initialization of a local variable in an xdr encoder. But I went back through the other recent rewrites and didn't spot any similar bugs.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47316"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:18Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix NULL dereference in nfs3svc_encode_getaclres\n\nIn error cases the dentry may be NULL.\n\nBefore 20798dfe249a, the encoder also checked dentry and\nd_really_is_positive(dentry), but that looks like overkill to me--zero\nstatus should be enough to guarantee a positive dentry.\n\nThis isn\u0027t the first time we\u0027ve seen an error-case NULL dereference\nhidden in the initialization of a local variable in an xdr encoder.  But\nI went back through the other recent rewrites and didn\u0027t spot any\nsimilar bugs.",
  "id": "GHSA-x95x-w6hq-mwxc",
  "modified": "2024-12-24T18:30:48Z",
  "published": "2024-05-21T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47316"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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