CVE-2025-64437
published 2025-11-07CVE-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…
PriorityP428medium5CVSS 3.1
AVLACHPRHUINSCCLILAL
EPSS
0.19%
8.9th percentile
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.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| kubevirt.io | kubevirt | >= 0 < 1.5.3 | 1.5.3 |
| kubevirt.io | kubevirt | >= 1.6.0-alpha.0 < 1.6.1 | 1.6.1 |
| kubevirt.io | kubevirt | >= 1.6.0-alpha.0 < 1.6.0-beta.0.0.20250801202148-3ce9f41c54d0 | 1.6.0-beta.0.0.20250801202148-3ce9f41c54d0 |
| kubevirt | kubevirt | < 1.5.3 | 1.5.3 |
| kubevirt | kubevirt | — | — |
| kubevirt | kubevirt | — | — |
| msrc | azl3_kubevirt_1.5.0-5_on_azure_linux_3.0 | — | — |
| msrc | cbl2_kubevirt_0.59.0-30_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_kubevirt_0.59.0-31_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_kubevirt_0.59.0-33_on_cbl_mariner_2.0 | — | — |
CVSS provenance
nvdv3.15.0MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L
vendor_msrc5.0MEDIUM
vendor_redhat5.0MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Microsoft
KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
vendor_msrc·2025-11-11·CVSS 5.0
CVE-2025-64437 [MEDIUM] CWE-59 KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
Mariner: Mariner
GitHub_M: GitHub_M
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade
Red Hat
kubevirt.io/kubevirt: KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
vendor_redhat·2025-11-07·CVSS 5.0
CVE-2025-64437 [MEDIUM] CWE-59 kubevirt.io/kubevirt: KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
kubevirt.io/kubevirt: KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
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.
A file path handling flaw has been discovered in KubeVirt. It is
OSV
KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes in kubevirt.io/kubevirt
osv·2025-11-17
CVE-2025-64437 KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes in kubevirt.io/kubevirt
KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes in kubevirt.io/kubevirt
KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes in kubevirt.io/kubevirt
GHSA
KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
ghsa·2025-11-06
CVE-2025-64437 [MEDIUM] CWE-59 KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
### Summary
_Short summary of the problem. Make the impact and severity as clear as possible.
It is possible to trick the `virt-handler` component into changing the ownership of arbitrary files on the host node to the unprivileged user with UID `107` due to mishandling of symlinks when determining the root mount of a `virt-launcher` pod.
### Details
_Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._
In the current implementation, 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 unprivilege
OSV
KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
osv·2025-11-06
CVE-2025-64437 [MEDIUM] KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
### Summary
_Short summary of the problem. Make the impact and severity as clear as possible.
It is possible to trick the `virt-handler` component into changing the ownership of arbitrary files on the host node to the unprivileged user with UID `107` due to mishandling of symlinks when determining the root mount of a `virt-launcher` pod.
### Details
_Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._
In the current implementation, 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 unprivilege
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/kubevirt/kubevirt/commit/3ce9f41c54d04a65f10b23a46771391c00659afbhttps://github.com/kubevirt/kubevirt/commit/8644dbe0d04784b0bfa8395b91ecbd6001f88f6bhttps://github.com/kubevirt/kubevirt/commit/f59ca63133f25de8fceb3e2a0e5cc0b7bdb6a265https://github.com/kubevirt/kubevirt/security/advisories/GHSA-2r4r-5x78-mvqf
2025-11-07
Published