CVE-2025-64437: kubevirt — Exploit & Fix

Description

KubeVirt is a virtual machine management add-on for Kubernetes. In versions before 1.5.3 and 1.6.1, the virt-handler does not verify whether the launcher-sock is a symlink or a regular file. This oversight can be exploited, for example, to change the ownership of arbitrary files on the host node to the unprivileged user with UID 107 (the same user used by virt-launcher) thus, compromising the CIA (Confidentiality, Integrity and Availability) of data on the host. To successfully exploit this vulnerability, an attacker should be in control of the file system of the virt-launcher pod. This vulnerability is fixed in 1.5.3 and 1.6.1.

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CVSS v3.1 Score

5.0

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L

Weakness Type (CWE)

CWE-59 CWE-59

Affected Products

Vendor	Product	Versions
kubevirt	kubevirt	< 1.5.3
kubevirt	kubevirt	All

References

Advisories & Patches

https://github.com/kubevirt/kubevirt/commit/3ce9f41c54d04a65f10b23a46771391c00659afb https://github.com/kubevirt/kubevirt/commit/8644dbe0d04784b0bfa8395b91ecbd6001f88f6b https://github.com/kubevirt/kubevirt/commit/f59ca63133f25de8fceb3e2a0e5cc0b7bdb6a265 https://github.com/kubevirt/kubevirt/security/advisories/GHSA-2r4r-5x78-mvqf

Exploits

https://github.com/kubevirt/kubevirt/security/advisories/GHSA-2r4r-5x78-mvqf

Frequently Asked Questions

What is CVE-2025-64437? +

KubeVirt is a virtual machine management add-on for Kubernetes. In versions before 1.5.3 and 1.6.1, the virt-handler does not verify whether the launcher-sock is a symlink or a regular file. This oversight can be exploited, for example, to change the ownership of arbitrary files on the host node to the unprivileged user with UID 107 (the same user used by virt-launcher) thus, compromising the CIA (Confidentiality, Integrity and Availability) of data on the host. To successfully exploit this vulnerability, an attacker should be in control of the file system of the virt-launcher pod. This vulnerability is fixed in 1.5.3 and 1.6.1. It has a CVSS v3.1 base score of 5.0 (MEDIUM).

How severe is CVE-2025-64437? +

CVE-2025-64437 has a CVSS v3.1 score of 5.0 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-64437? +

CVE-2025-64437 affects products from kubevirt, specifically: kubevirt. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-64437? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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