ghsa-35cx-v8jm-4qrv
Vulnerability from github
Published
2024-11-07 12:30
Modified
2025-11-04 00:31
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:

xfrm: validate new SA's prefixlen using SA family when sel.family is unset

This expands the validation introduced in commit 07bf7908950a ("xfrm: Validate address prefix lengths in the xfrm selector.")

syzbot created an SA with usersa.sel.family = AF_UNSPEC usersa.sel.prefixlen_s = 128 usersa.family = AF_INET

Because of the AF_UNSPEC selector, verify_newsa_info doesn't put limits on prefixlen_{s,d}. But then copy_from_user_state sets x->sel.family to usersa.family (AF_INET). Do the same conversion in verify_newsa_info before validating prefixlen_{s,d}, since that's how prefixlen is going to be used later on.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-50142"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-11-07T10:15:06Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: validate new SA\u0027s prefixlen using SA family when sel.family is unset\n\nThis expands the validation introduced in commit 07bf7908950a (\"xfrm:\nValidate address prefix lengths in the xfrm selector.\")\n\nsyzbot created an SA with\n    usersa.sel.family = AF_UNSPEC\n    usersa.sel.prefixlen_s = 128\n    usersa.family = AF_INET\n\nBecause of the AF_UNSPEC selector, verify_newsa_info doesn\u0027t put\nlimits on prefixlen_{s,d}. But then copy_from_user_state sets\nx-\u003esel.family to usersa.family (AF_INET). Do the same conversion in\nverify_newsa_info before validating prefixlen_{s,d}, since that\u0027s how\nprefixlen is going to be used later on.",
  "id": "GHSA-35cx-v8jm-4qrv",
  "modified": "2025-11-04T00:31:56Z",
  "published": "2024-11-07T12:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50142"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/401ad99a5ae7180dd9449eac104cb755f442e7f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d9868180bd1e4cf37e7c5067362658971162366"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8df5cd51fd70c33aa1776e5cbcd82b0a86649d73"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bce1afaa212ec380bf971614f70909a27882b862"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e68dd80ba498265d2266b12dc3459164f4ff0c4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f31398570acf0f0804c644006f7bfa9067106b0a"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
    }
  ],
  "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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