CVE-2025-68221 mptcp: fix address removal logic in mptcp_pm_nl_rm_addr
Not scored
Published
Updated
Check this codebase for CVE-2025-68221 and fix it if it is affected.
What it is: CVE-2025-68221 is a vulnerability in Linux, published on 16 Dec 2025.
Exploitation: There is no known exploitation of CVE-2025-68221 in the wild and no public exploit code.
Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2025-68221/ (Markdown: https://insights.sbomify.com/CVE-2025-68221/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2025-68221?
CVE-2025-68221 is a vulnerability in Linux, published on 16 Dec 2025.
Official 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.
Which versions are affected by CVE-2025-68221?
How do I fix CVE-2025-68221?
Upgrade to a fixed version.
Is CVE-2025-68221 being exploited?
There is no known exploitation of CVE-2025-68221 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-68221, DEBIAN-CVE-2025-68221, GHSA-9rj5-8f4h-5c5g, UBUNTU-CVE-2025-68221.