ghsa-hwc3-9p27-c4j6
Vulnerability from github
Published
2024-07-29 18:30
Modified
2024-07-30 21:31
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:

bpf: Fix may_goto with negative offset.

Zac's syzbot crafted a bpf prog that exposed two bugs in may_goto. The 1st bug is the way may_goto is patched. When offset is negative it should be patched differently. The 2nd bug is in the verifier: when current state may_goto_depth is equal to visited state may_goto_depth it means there is an actual infinite loop. It's not correct to prune exploration of the program at this point. Note, that this check doesn't limit the program to only one may_goto insn, since 2nd and any further may_goto will increment may_goto_depth only in the queued state pushed for future exploration. The current state will have may_goto_depth == 0 regardless of number of may_goto insns and the verifier has to explore the program until bpf_exit.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-42072"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-29T16:15:06Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix may_goto with negative offset.\n\nZac\u0027s syzbot crafted a bpf prog that exposed two bugs in may_goto.\nThe 1st bug is the way may_goto is patched. When offset is negative\nit should be patched differently.\nThe 2nd bug is in the verifier:\nwhen current state may_goto_depth is equal to visited state may_goto_depth\nit means there is an actual infinite loop. It\u0027s not correct to prune\nexploration of the program at this point.\nNote, that this check doesn\u0027t limit the program to only one may_goto insn,\nsince 2nd and any further may_goto will increment may_goto_depth only\nin the queued state pushed for future exploration. The current state\nwill have may_goto_depth == 0 regardless of number of may_goto insns\nand the verifier has to explore the program until bpf_exit.",
  "id": "GHSA-hwc3-9p27-c4j6",
  "modified": "2024-07-30T21:31:26Z",
  "published": "2024-07-29T18:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-42072"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/175827e04f4be53f3dfb57edf12d0d49b18fd939"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b2efe1937ca9f8815884bd4dcd5b32733025103"
    }
  ],
  "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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