ghsa-559c-j26r-95qc
Vulnerability from github
Published
2024-04-28 15:30
Modified
2024-04-28 15:30
Details

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

sfc: fix null pointer dereference in efx_hard_start_xmit

Trying to get the channel from the tx_queue variable here is wrong because we can only be here if tx_queue is NULL, so we shouldn't dereference it. As the above comment in the code says, this is very unlikely to happen, but it's wrong anyway so let's fix it.

I hit this issue because of a different bug that caused tx_queue to be NULL. If that happens, this is the error message that we get here: BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 [...] RIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc]

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{
  "affected": [],
  "aliases": [
    "CVE-2022-48648"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-28T13:15:07Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: fix null pointer dereference in efx_hard_start_xmit\n\nTrying to get the channel from the tx_queue variable here is wrong\nbecause we can only be here if tx_queue is NULL, so we shouldn\u0027t\ndereference it. As the above comment in the code says, this is very\nunlikely to happen, but it\u0027s wrong anyway so let\u0027s fix it.\n\nI hit this issue because of a different bug that caused tx_queue to be\nNULL. If that happens, this is the error message that we get here:\n  BUG: unable to handle kernel NULL pointer dereference at 0000000000000020\n  [...]\n  RIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc]",
  "id": "GHSA-559c-j26r-95qc",
  "modified": "2024-04-28T15:30:29Z",
  "published": "2024-04-28T15:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48648"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a242eb2913a4aa3d6fbdb86559f27628e9466f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8547c7bfc0617e7184e4da65b9b96681fcfe9998"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3b41d4d95d3822b2e459ecbc80d030ea6aec5e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3b952168ee1f220ba729fa100fd9d5aa752eb03"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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