GHSA-WPWP-37FG-5MF6

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

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

wifi: mac80211_hwsim: clamp virtio RX length before skb_put

hwsim_virtio_rx_work() passes the virtqueue used-ring length reported by the device straight to skb_put() on a fixed-size receive skb. A backend reporting a length larger than the skb tailroom drives skb_put() past the buffer end and hits skb_over_panic() -- a host-triggerable guest panic (denial of service).

Clamp the length to the skb's available room before skb_put(). A conforming device never reports more than the posted buffer size, so valid frames are unaffected; a truncated over-report then fails the length/header checks in hwsim_virtio_handle_cmd() and is dropped, so truncating rather than dropping here cannot be turned into a parsing problem.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68411"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:34Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211_hwsim: clamp virtio RX length before skb_put\n\nhwsim_virtio_rx_work() passes the virtqueue used-ring length reported by\nthe device straight to skb_put() on a fixed-size receive skb. A backend\nreporting a length larger than the skb tailroom drives skb_put() past the\nbuffer end and hits skb_over_panic() -- a host-triggerable guest panic\n(denial of service).\n\nClamp the length to the skb\u0027s available room before skb_put(). A\nconforming device never reports more than the posted buffer size, so valid\nframes are unaffected; a truncated over-report then fails the\nlength/header checks in hwsim_virtio_handle_cmd() and is dropped, so\ntruncating rather than dropping here cannot be turned into a parsing\nproblem.",
  "id": "GHSA-wpwp-37fg-5mf6",
  "modified": "2026-08-19T18:32:19Z",
  "published": "2026-08-10T15:33:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68411"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10a2b430f8f06ae14b9590b6f6faa6b588ef0654"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5779e4a33e1666ddfeba43e96e29c4a9e5254ff0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6dc76371a9a360c29de00df5b11563102d9d675a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f9d678b870fca8eaf1d46fa915cba0b1d5b387a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82c5a30a66e2a7337d99476c67d6fc1a99c4250e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/909573d6a9b67354fc0515952574564e7c909c62"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/99dc05c75acc3c8cde8d89c5371f4b569de5ac62"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fade308845c89f784da8a6780c1e77258488f1b6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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