GHSA-XQCF-GWJ9-5C88

Vulnerability from github – Published: 2026-06-09 15:32 – Updated: 2026-06-19 15:33
VLAI
Details

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

tap: free page on error paths in tap_get_user_xdp()

tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL, and returns -ENOMEM when build_skb() fails. Both paths jump to the err label without freeing the page that vhost_net_build_xdp() allocated for the frame. tap_sendmsg() discards the per-buffer return value and always returns 0, so vhost_tx_batch() takes the success path and never frees the page; each rejected frame in a batch leaks one page-frag chunk.

Free the page on both error paths, before the skb is built. This is the tap counterpart of the same leak in tun_xdp_one().

Severity
7.4 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-46320"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-09T13:16:37Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntap: free page on error paths in tap_get_user_xdp()\n\ntap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL,\nand returns -ENOMEM when build_skb() fails. Both paths jump to the err\nlabel without freeing the page that vhost_net_build_xdp() allocated for\nthe frame. tap_sendmsg() discards the per-buffer return value and always\nreturns 0, so vhost_tx_batch() takes the success path and never frees\nthe page; each rejected frame in a batch leaks one page-frag chunk.\n\nFree the page on both error paths, before the skb is built. This is the\ntap counterpart of the same leak in tun_xdp_one().",
  "id": "GHSA-xqcf-gwj9-5c88",
  "modified": "2026-06-19T15:33:14Z",
  "published": "2026-06-09T15:32:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46320"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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