ghsa-g3v7-q58w-w9qx
Vulnerability from github
Published
2024-07-30 09:31
Modified
2024-12-19 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:

net: rswitch: Avoid use-after-free in rswitch_poll()

The use-after-free is actually in rswitch_tx_free(), which is inlined in rswitch_poll(). Since skb and gq->skbs[gq->dirty] are in fact the same pointer, the skb is first freed using dev_kfree_skb_any(), then the value in skb->len is used to update the interface statistics.

Let's move around the instructions to use skb->len before the skb is freed.

This bug is trivial to reproduce using KFENCE. It will trigger a splat every few packets. A simple ARP request or ICMP echo request is enough.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-42108"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-30T08:15:03Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rswitch: Avoid use-after-free in rswitch_poll()\n\nThe use-after-free is actually in rswitch_tx_free(), which is inlined in\nrswitch_poll(). Since `skb` and `gq-\u003eskbs[gq-\u003edirty]` are in fact the\nsame pointer, the skb is first freed using dev_kfree_skb_any(), then the\nvalue in skb-\u003elen is used to update the interface statistics.\n\nLet\u0027s move around the instructions to use skb-\u003elen before the skb is\nfreed.\n\nThis bug is trivial to reproduce using KFENCE. It will trigger a splat\nevery few packets. A simple ARP request or ICMP echo request is enough.",
  "id": "GHSA-g3v7-q58w-w9qx",
  "modified": "2024-12-19T21:31:08Z",
  "published": "2024-07-30T09:31:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-42108"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a41bb9f2b402469d425a1c13359d3b3ea4e6403"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92cbbe7759193e3418f38d0d73f8fe125312c58b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a0c28efeec6383ef22e97437616b920e7320b67"
    }
  ],
  "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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