Is CVE-2025-68221 in the CISA KEV catalog?

No. CVE-2025-68221 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the EPSS score for CVE-2025-68221?

CVE-2025-68221 has an EPSS score of 0.17% (7th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-68221?

Upgrade linux on debian unstable to 6.17.10-1 or later. Fixes are available for 61 affected products.

CVE & CISA-KEV Catalog

CVE-2025-68221

UNSCORED

NVD

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.

How to fix

Remediation Available

linuxDebian

Fixed in:6.17.10-1CVE-2025-68221

linuxUbuntu

Fixed in:6.17.0-19.19USN-8094-1

linux-awsUbuntu

Fixed in:6.17.0-1009.9USN-8094-1

linux-aws-6.17Ubuntu

Fixed in:6.17.0-1009.9~24.04.2USN-8094-1

linux-azureUbuntu

Fixed in:6.17.0-1010.10USN-8094-4

linux-azure-6.17Ubuntu

Fixed in:6.17.0-1010.10~24.04.1USN-8094-4

linux-gcpUbuntu

Fixed in:6.17.0-1009.9USN-8094-1

linux-gcp-6.17Ubuntu

Fixed in:6.17.0-1009.9~24.04.3USN-8094-2

linux-hwe-6.17Ubuntu

Fixed in:6.17.0-19.19~24.04.2USN-8094-1

linux-image-6.17.0-1008-realtimeUbuntu

Fixed in:6.17.0-1008.9~24.04.1USN-8094-3

Fixed in:6.17.0-1008.9USN-8094-2

linux-image-6.17.0-1009-awsUbuntu

Fixed in:6.17.0-1009.9~24.04.2USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-6.17.0-1009-aws-64kUbuntu

Fixed in:6.17.0-1009.9~24.04.2USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-6.17.0-1009-gcpUbuntu

Fixed in:6.17.0-1009.9~24.04.3USN-8094-2

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-6.17.0-1009-gcp-64kUbuntu

Fixed in:6.17.0-1009.9~24.04.3USN-8094-2

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-6.17.0-1009-oracleUbuntu

Fixed in:6.17.0-1009.9~24.04.1USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-6.17.0-1009-oracle-64kUbuntu

Fixed in:6.17.0-1009.9~24.04.1USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-6.17.0-1010-azureUbuntu

Fixed in:6.17.0-1010.10~24.04.1USN-8094-4

Fixed in:6.17.0-1010.10USN-8094-4

linux-image-6.17.0-1010-raspiUbuntu

Fixed in:6.17.0-1010.10USN-8094-5

linux-image-6.17.0-1017-oemUbuntu

Fixed in:6.17.0-1017.17USN-8152-1

linux-image-6.17.0-19-genericUbuntu

Fixed in:6.17.0-19.19~24.04.2USN-8094-1

Fixed in:6.17.0-19.19USN-8094-1

linux-image-6.17.0-19-generic-64kUbuntu

Fixed in:6.17.0-19.19~24.04.2USN-8094-1

Fixed in:6.17.0-19.19USN-8094-1

linux-image-awsUbuntu

Fixed in:6.17.0-1009.9~24.04.2USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-aws-6.17Ubuntu

Fixed in:6.17.0-1009.9~24.04.2USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-aws-64kUbuntu

Fixed in:6.17.0-1009.9~24.04.2USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-aws-64k-6.17Ubuntu

Fixed in:6.17.0-1009.9~24.04.2USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-azureUbuntu

Fixed in:6.17.0-1010.10~24.04.1USN-8094-4

Fixed in:6.17.0-1010.10USN-8094-4

linux-image-azure-6.17Ubuntu

Fixed in:6.17.0-1010.10~24.04.1USN-8094-4

Fixed in:6.17.0-1010.10USN-8094-4

linux-image-gcpUbuntu

Fixed in:6.17.0-1009.9~24.04.3USN-8094-2

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-gcp-6.17Ubuntu

Fixed in:6.17.0-1009.9~24.04.3USN-8094-2

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-gcp-64kUbuntu

Fixed in:6.17.0-1009.9~24.04.3USN-8094-2

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-gcp-64k-6.17Ubuntu

Fixed in:6.17.0-1009.9~24.04.3USN-8094-2

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-genericUbuntu

Fixed in:6.17.0-19.19USN-8094-1

linux-image-generic-6.17Ubuntu

Fixed in:6.17.0-19.19~24.04.2USN-8094-1

Fixed in:6.17.0-19.19USN-8094-1

linux-image-generic-64kUbuntu

Fixed in:6.17.0-19.19USN-8094-1

linux-image-generic-64k-6.17Ubuntu

Fixed in:6.17.0-19.19~24.04.2USN-8094-1

Fixed in:6.17.0-19.19USN-8094-1

linux-image-generic-64k-hwe-24.04Ubuntu

Fixed in:6.17.0-19.19~24.04.2USN-8094-1

linux-image-generic-hwe-24.04Ubuntu

Fixed in:6.17.0-19.19~24.04.2USN-8094-1

linux-image-oem-24.04Ubuntu

Fixed in:6.17.0-1017.17USN-8152-1

linux-image-oem-24.04aUbuntu

Fixed in:6.17.0-1017.17USN-8152-1

linux-image-oem-24.04bUbuntu

Fixed in:6.17.0-1017.17USN-8152-1

linux-image-oem-24.04cUbuntu

Fixed in:6.17.0-1017.17USN-8152-1

linux-image-oem-24.04dUbuntu

Fixed in:6.17.0-1017.17USN-8152-1

linux-image-oem-6.17Ubuntu

Fixed in:6.17.0-1017.17USN-8152-1

linux-image-oracleUbuntu

Fixed in:6.17.0-1009.9~24.04.1USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-oracle-6.17Ubuntu

Fixed in:6.17.0-1009.9~24.04.1USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-oracle-64kUbuntu

Fixed in:6.17.0-1009.9~24.04.1USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-oracle-64k-6.17Ubuntu

Fixed in:6.17.0-1009.9~24.04.1USN-8094-1

Fixed in:6.17.0-1009.9USN-8094-1

linux-image-raspiUbuntu

Fixed in:6.17.0-1010.10USN-8094-5

linux-image-raspi-6.17Ubuntu

Fixed in:6.17.0-1010.10USN-8094-5

linux-image-realtimeUbuntu

Fixed in:6.17.0-1008.9USN-8094-2

linux-image-realtime-6.17Ubuntu

Fixed in:6.17.0-1008.9~24.04.1USN-8094-3

Fixed in:6.17.0-1008.9USN-8094-2

linux-image-realtime-hwe-24.04Ubuntu

Fixed in:6.17.0-1008.9~24.04.1USN-8094-3

Fixed in:6.17.0-1008.9USN-8094-2

linux-image-virtualUbuntu

Fixed in:6.17.0-19.19USN-8094-1

linux-image-virtual-6.17Ubuntu

Fixed in:6.17.0-19.19~24.04.2USN-8094-1

Fixed in:6.17.0-19.19USN-8094-1

linux-image-virtual-hwe-24.04Ubuntu

Fixed in:6.17.0-19.19~24.04.2USN-8094-1

linux-oem-6.17Ubuntu

Fixed in:6.17.0-1017.17USN-8152-1

linux-oracleUbuntu

Fixed in:6.17.0-1009.9USN-8094-1

linux-oracle-6.17Ubuntu

Fixed in:6.17.0-1009.9~24.04.1USN-8094-1

linux-raspiUbuntu

Fixed in:6.17.0-1010.10USN-8094-5

linux-realtimeUbuntu

Fixed in:6.17.0-1008.9USN-8094-2

linux-realtime-6.17Ubuntu

Fixed in:6.17.0-1008.9~24.04.1USN-8094-3

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3.1 Vector

No CVSS vector data available.

Exploit Intelligence

0.17%probability of exploitation in 30 days

7thpercentile

Low risk: more likely to be exploited than 7% of all known CVEs.

References

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-18.