xdp: fix zero-copy frame layout

{
  "id": "ba896c85cbb317da0100c167c1946445a1fa32b2b989829db1e8e436d0e5487b",
  "url": "https://osv.dev/vulnerability/CVE-2026-81002",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xdp: fix zero-copy frame layout",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xdp: fix zero-copy frame layout xdp_convert_zc_to_xdp_frame() clones an XSK packet into an order-0 page and advertises PAGE_SIZE as its frame size. It allows the copied frame to occupy the page tail needed by skb_shared_info and records zero headroom even when metadata separates the frame header from packet data. An AF_XDP zero-copy packet redirected through cpumap can therefore make the skb overlap skb_shared_info or place it beyond the allocated page. Limit the copied layout to SKB_WITH_OVERHEAD(PAGE_SIZE) and include the metadata length in frame headroom. Redirect callers already handle a NULL conversion result. BUG: KASAN: slab-out-of-bounds in skb_gro_receive Write of size 4 at addr ffff88800cf37004 by task cpumap/1/map:1/146 Call Trace: skb_gro_receive (net/core/gro.c:174) udp_gro_receive (net/ipv4/udp_offload.c:812) inet_gro_receive (net/ipv4/af_inet.c:1539) dev_gro_receive (net/core/gro.c:515) gro_receive_skb (net/core/gro.c:633) cpu_map_kthread_run (kernel/bpf/cpumap.c:395) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:164) ret_from_fork_asm (arch/x86/entry/entry_64.S:255) Kernel panic - not syncing: KASAN: panic_on_warn set ...",
    "evidence": "osv:CVE-2026-81002",
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      "modified": "2026-10-28T02:30:49.328673592Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/15d1f3c0dbe7a740f779337deb39f23cd8d002c8",
        "https://git.kernel.org/stable/c/22092730129077c302d8c947bbe0876f0280c528",
        "https://git.kernel.org/stable/c/444216dacdbebd3e52d5e704facafbb230da09e9",
        "https://git.kernel.org/stable/c/68d7cc5512238693670fc19c7a615df631e10edf",
        "https://git.kernel.org/stable/c/6de17275b3ccdf9887568b07e54da2e3597217cf",
        "https://git.kernel.org/stable/c/71283aaa6c65b3cec84caf1dc78560985737641f",
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        "https://git.kernel.org/stable/c/dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81002.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-81002",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 517687,
  "published_at": "2026-09-11T19:42:55.506+00:00"
}