GHSA-5X23-W3HG-QFCX

Vulnerability from github – Published: 2024-07-12 15:31 – Updated: 2025-11-04 00:30
VLAI?
Details

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

bpf: Avoid splat in pskb_pull_reason

syzkaller builds (CONFIG_DEBUG_NET=y) frequently trigger a debug hint in pskb_may_pull.

We'd like to retain this debug check because it might hint at integer overflows and other issues (kernel code should pull headers, not huge value).

In bpf case, this splat isn't interesting at all: such (nonsensical) bpf programs are typically generated by a fuzzer anyway.

Do what Eric suggested and suppress such warning.

For CONFIG_DEBUG_NET=n we don't need the extra check because pskb_may_pull will do the right thing: return an error without the WARN() backtrace.

Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-40996"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-12T13:15:20Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Avoid splat in pskb_pull_reason\n\nsyzkaller builds (CONFIG_DEBUG_NET=y) frequently trigger a debug\nhint in pskb_may_pull.\n\nWe\u0027d like to retain this debug check because it might hint at integer\noverflows and other issues (kernel code should pull headers, not huge\nvalue).\n\nIn bpf case, this splat isn\u0027t interesting at all: such (nonsensical)\nbpf programs are typically generated by a fuzzer anyway.\n\nDo what Eric suggested and suppress such warning.\n\nFor CONFIG_DEBUG_NET=n we don\u0027t need the extra check because\npskb_may_pull will do the right thing: return an error without the\nWARN() backtrace.",
  "id": "GHSA-5x23-w3hg-qfcx",
  "modified": "2025-11-04T00:30:57Z",
  "published": "2024-07-12T15:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-40996"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2bbe3e5a2f4ef69d13be54f1cf895b4658287080"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e90258303a358e88737afb5048bee9113beea3a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f9644782c559635bd676c12c59389a34ed7c866"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dacc15e9cb248d19e5fc63c54bef0b9b55007761"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "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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