Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2025-21669

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: discard packets if the transport changes If the socket has been de-assigned or assigned to another transport, we…

Published Jan 31, 2025CWE-476EPSS 0.23%

Overview

CVE-2025-21669 is a high-severity vulnerability. It was published on January 31, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: discard packets if the transport changes

If the socket has been de-assigned or assigned to another transport,

we must discard any packets received because they are not expected

and would cause issues when we access vsk->transport.

A possible scenario is described by Hyunwoo Kim in the attached link,

where after a first connect() interrupted by a signal, and a second

connect() failed, we can find `vsk->transport` at NULL, leading to a

NULL pointer dereference.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/18a7fc371d1dbf8deff16c2dd9292bcc73f43040Refgit.kernel.org/stable/c/2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1Refgit.kernel.org/stable/c/6486915fa661584d70e8e7e4068c6c075c67dd6dRefgit.kernel.org/stable/c/677579b641af109613564460a4e3bdcb16850b61Refgit.kernel.org/stable/c/88244163bc7e7b0ce9dd7bf4c8a563b41525c3eeRefgit.kernel.org/stable/c/d88b249e14bd0ee1e46bbe4f456e22e01b8c68deReflists.debian.org/debian-lts-announce/2025/03/msg00001.htmlReflists.debian.org/debian-lts-announce/2025/03/msg00002.htmlRefcert-portal.siemens.com/productcert/html/ssa-265688.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21669?

CVE-2025-21669 is a high-severity vulnerability. It was published on January 31, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-21669?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21669?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-21669?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21669 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2025

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999