GHSA-XHRR-QP73-MJ8C

Vulnerability from github – Published: 2026-10-18 18:31 – Updated: 2026-10-18 18:31
VLAI
Details

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

net: usb: catc: bound the RX packet length in catc_rx_done()

catc_rx_done() walks a multi-packet URB, reading a two-byte length from each packet header. Its bound, pkt_len > urb->actual_length, ignores the header offset and compares against the whole transfer rather than the bytes left from pkt_start, so a crafted packet header makes skb_copy_to_linear_data() read past the buffer.

A length below ETH_HLEN is also accepted, including zero, and eth_type_trans() then reads a MAC header from the uninitialised tailroom of a shorter skb. The is_f5u011 branch takes its length straight from the transfer, so a zero-length URB reaches the same path.

Track the bytes remaining from the current packet, and reject a header that does not fit, a length past what is left, and a length below an Ethernet header.

A transfer shorter than an Ethernet header, including a zero-length one, previously became a runt skb passed to netif_rx() and counted as received; it is now counted in rx_length_errors and ends the walk.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98612"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:14Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: catc: bound the RX packet length in catc_rx_done()\n\ncatc_rx_done() walks a multi-packet URB, reading a two-byte length from\neach packet header. Its bound, pkt_len \u003e urb-\u003eactual_length, ignores the\nheader offset and compares against the whole transfer rather than the\nbytes left from pkt_start, so a crafted packet header makes\nskb_copy_to_linear_data() read past the buffer.\n\nA length below ETH_HLEN is also accepted, including zero, and\neth_type_trans() then reads a MAC header from the uninitialised tailroom\nof a shorter skb. The is_f5u011 branch takes its length straight from\nthe transfer, so a zero-length URB reaches the same path.\n\nTrack the bytes remaining from the current packet, and reject a header\nthat does not fit, a length past what is left, and a length below an\nEthernet header.\n\nA transfer shorter than an Ethernet header, including a zero-length one,\npreviously became a runt skb passed to netif_rx() and counted as\nreceived; it is now counted in rx_length_errors and ends the walk.",
  "id": "GHSA-xhrr-qp73-mj8c",
  "modified": "2026-10-18T18:31:56Z",
  "published": "2026-10-18T18:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98612"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21e206dd88b3de6e36bb607dec3797c59bc3007b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f87bbd5a7bf6ee79d598f7e22cf77810d29ae87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3942557938f846e7481f6ccb2b41ccbdee61baa1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4cc0a8eb2f9336cfa3e4ac329bc5585ca970ced3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/801e21cf7dd6bcee31db907625d5045f21c9c1d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d4be026bdff2c1da7b6c7e01c0a47f2df409e97"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d565b6b72fe3f41fd43636e143072848105189f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd9c6f8f05170223edec2dac476606cd40d9acb7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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