What’s Vulnerable › Vulnerabilities

CVE-2025-68221: mptcp: fix address removal logic in mptcp_pm_nl_rm_addr

• 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 2026-10-14

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix address removal logic in mptcp_pm_nl_rm_addr Fix inverted WARN_ON_ONCE condition that prevented normal address removal counter updates. The current code only executes decrement logic when the counter is already 0 (abnormal state), while normal removals (counter > 0) are ignored.

Affected products

• Linux kernel: 6.15 — fixed in 6.18

How to fix

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

References

• https://git.kernel.org/stable/c/92e239e36d600002559074994a545fcfac9afd2d
• https://git.kernel.org/stable/c/f7d953c38245c0e9d8e268fb6a9e524602fb44ec

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