What’s Vulnerable › Vulnerabilities

CVE-2025-68188: tcp: use dst_dev_rcu() in tcp_fastopen_active_disable_ofo_check()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-16 · updated 2026-10-30

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.

Affected products

• Linux: 4.12 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux 6.18. Check the vendor advisory for mitigations.

References

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

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