ghsa-x793-gh9g-39hm
Vulnerability from github
Published
2025-12-24 12:30
Modified
2025-12-24 12:30
Details

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

wifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()

The rtl8187_rx_cb() calculates the rx descriptor header address by subtracting its size from the skb tail pointer. However, it does not validate if the received packet (skb->len from urb->actual_length) is large enough to contain this header.

If a truncated packet is received, this will lead to a buffer underflow, reading memory before the start of the skb data area, and causing a kernel panic.

Add length checks for both rtl8187 and rtl8187b descriptor headers before attempting to access them, dropping the packet cleanly if the check fails.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68362"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-24T11:15:59Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()\n\nThe rtl8187_rx_cb() calculates the rx descriptor header address\nby subtracting its size from the skb tail pointer.\nHowever, it does not validate if the received packet\n(skb-\u003elen from urb-\u003eactual_length) is large enough to contain this\nheader.\n\nIf a truncated packet is received, this will lead to a buffer\nunderflow, reading memory before the start of the skb data area,\nand causing a kernel panic.\n\nAdd length checks for both rtl8187 and rtl8187b descriptor headers\nbefore attempting to access them, dropping the packet cleanly if the\ncheck fails.",
  "id": "GHSA-x793-gh9g-39hm",
  "modified": "2025-12-24T12:30:29Z",
  "published": "2025-12-24T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68362"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4758770a673c60d8f615809304d72e1432fa6355"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ebf0fe7eaef9f6173a4c6ea77c5353e21645d15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/638d4148e166d114a4cd7becaae992ce1a815ed8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b647d2574e4583c2e3b0ab35568f60c88e910840"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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