Bug 2422659 (CVE-2025-68221)

Summary: CVE-2025-68221 kernel: mptcp: fix address removal logic in mptcp_pm_nl_rm_addr
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-12-16 14:01:38 UTC 
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.
Comment 1 Alexander B 2025-12-17 05:16:33 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121633-CVE-2025-68221-7f16@gregkh/T