ghsa-pmp7-xx3c-wr9q
Vulnerability from github
Published
2024-03-11 18:31
Modified
2024-03-11 18:31
Details

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

netfilter: nf_tables: reject QUEUE/DROP verdict parameters

This reverts commit e0abdadcc6e1.

core.c:nf_hook_slow assumes that the upper 16 bits of NF_DROP verdicts contain a valid errno, i.e. -EPERM, -EHOSTUNREACH or similar, or 0.

Due to the reverted commit, its possible to provide a positive value, e.g. NF_ACCEPT (1), which results in use-after-free.

Its not clear to me why this commit was made.

NF_QUEUE is not used by nftables; "queue" rules in nftables will result in use of "nft_queue" expression.

If we later need to allow specifiying errno values from userspace (do not know why), this has to call NF_DROP_GETERR and check that "err <= 0" holds true.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-26609"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-03-11T18:15:19Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: reject QUEUE/DROP verdict parameters\n\nThis reverts commit e0abdadcc6e1.\n\ncore.c:nf_hook_slow assumes that the upper 16 bits of NF_DROP\nverdicts contain a valid errno, i.e. -EPERM, -EHOSTUNREACH or similar,\nor 0.\n\nDue to the reverted commit, its possible to provide a positive\nvalue, e.g. NF_ACCEPT (1), which results in use-after-free.\n\nIts not clear to me why this commit was made.\n\nNF_QUEUE is not used by nftables; \"queue\" rules in nftables\nwill result in use of \"nft_queue\" expression.\n\nIf we later need to allow specifiying errno values from userspace\n(do not know why), this has to call NF_DROP_GETERR and check that\n\"err \u003c= 0\" holds true.",
  "id": "GHSA-pmp7-xx3c-wr9q",
  "modified": "2024-03-11T18:31:10Z",
  "published": "2024-03-11T18:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26609"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e66422f1b56149761dc76030e6345d1cca6f869"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/55a60251fa50d4e68175e36666b536a602ce4f6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6653118b176a00915125521c6572ae8e507621db"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8365e9d92b85fda975a5ece7a3a139cb964018c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e34430e33b8a80bc014f3efe29cac76bc30a4b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/960cf4f812530f01f6acc6878ceaa5404c06af7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f05a497e7bc8851eeeb3a58da180ba469efebb05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f342de4e2f33e0e39165d8639387aa6c19dff660"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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