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

Quick assessment

Affected
kubevirt kubevirt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kubevirt是KubeVirt开源的一款虚拟机管理器。 KubeVirt 1.5.3之前版本和1.6.1之前版本存在后置链接漏洞，该漏洞源于virt-handler未验证launcher-sock是否为符号链接或常规文件，可能导致主机节点上任意文件所有权被更改。

CVSS 5.0 · Medium EPSS 0.21% · P11
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I. Basic Information for CVE-2025-64437

Vulnerability Information
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Vulnerability Title
KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Kubevirt 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubevirt是KubeVirt开源的一款虚拟机管理器。 KubeVirt 1.5.3之前版本和1.6.1之前版本存在后置链接漏洞，该漏洞源于virt-handler未验证launcher-sock是否为符号链接或常规文件，可能导致主机节点上任意文件所有权被更改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kubevirt kubevirt < 1.5.3 -

II. Public POCs for CVE-2025-64437

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III. Intelligence Information for CVE-2025-64437

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Vendor Advisories for CVE-2025-64437 (1)

Same Patch Batch · kubevirt · 2025-11-07 · 6 CVEs total

CVE-2025-64433 6.5 MEDIUM KubeVirt Arbitrary Container File Read
CVE-2025-64435 5.3 MEDIUM KubeVirt VMI Denial-of-Service (DoS) Using Pod Impersonation
CVE-2025-64432 4.7 MEDIUM KubeVirt Affected by an Authentication Bypass in Kubernetes Aggregation Layer
CVE-2025-64434 4.7 MEDIUM KubeVirt Improper TLS Certificate Management Handling Allows API Identity Spoofing
CVE-2025-64436 KubeVirt Excessive Role Permissions Could Enable Unauthorized VMI Migrations Between Nodes

IV. Related Vulnerabilities

Same product: kubevirt
Same vendor: kubevirt
Same weakness: CWE-59

V. Comments for CVE-2025-64437

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