GHSA-X7HH-PF5F-27MW

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-22 18:30
VLAI
Details

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

xdp: reject clones that overrun skb_shared_info tailroom

xdpf_clone() clones broadcast copies into a single page and sets frame_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that page like a normal XDP frame and expects the usual skb_shared_info tailroom at the end of the buffer.

The current check only rejects frames whose linear xdp_frame header, headroom, and packet data exceed PAGE_SIZE. A source frame backed by a larger allocation can still satisfy that check while extending into the clone's required shared-info area. When such a clone is converted back into an skb, build_skb_around() places skb_shared_info over live packet bytes and later writes can corrupt XDP return metadata.

Reject clones unless their linear area fits inside SKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already enforced by the XDP-to-skb conversion path.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74616"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:34Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxdp: reject clones that overrun skb_shared_info tailroom\n\nxdpf_clone() clones broadcast copies into a single page and sets\nframe_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that\npage like a normal XDP frame and expects the usual skb_shared_info\ntailroom at the end of the buffer.\n\nThe current check only rejects frames whose linear xdp_frame header,\nheadroom, and packet data exceed PAGE_SIZE. A source frame backed by a\nlarger allocation can still satisfy that check while extending into the\nclone\u0027s required shared-info area. When such a clone is converted back\ninto an skb, build_skb_around() places skb_shared_info over live packet\nbytes and later writes can corrupt XDP return metadata.\n\nReject clones unless their linear area fits inside\nSKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already\nenforced by the XDP-to-skb conversion path.",
  "id": "GHSA-x7hh-pf5f-27mw",
  "modified": "2026-08-22T18:30:27Z",
  "published": "2026-08-22T18:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74616"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58408982fa39f9758124cec169f42854d6f98f35"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/685edea27ac68d08fe4dbd3de74b858d2ad8e830"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba13763d667e008e185fedf592d53846a5b457d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e48e8edbef2eb824201495daa5234560f632b23c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef4b7c7046d29a67090de15af0da0d1ae8d1b192"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f463b6f4957c9c3fd1c75f8d3e5af4879fa609c0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fab820f1691a9e26d9031f18aae1e9ce09078f92"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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