# CVE-2026-5164: A flaw was found in virtio-win. The `RhelDoUnMap()` function does not properly validate the number of descriptors…

Source: https://junglewise.ai/threats/cve-2026-5164-a-flaw-was-found-in-virtio-win-the-rheldounmap-function-does-not  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-30  
License: CC BY 4.0 with a link back

CVE-2026-5164 · Severity: medium · CVSS 6.7 · Published 2026-03-30

A flaw was found in virtio-win. The `RhelDoUnMap()` function does not properly validate the number of descriptors provided by a user during an unmap request. A local user could exploit this input validation vulnerability by supplying an excessive number of descriptors, leading to a buffer overrun. This can cause a system crash, resulting in a Denial of Service (DoS).

Technologies: [Redhat Enterprise Linux](https://junglewise.ai/threats/technologies/enterprise-linux). Vendors: [Redhat](https://junglewise.ai/threats/vendors/redhat).

## Quick answers

**Is CVE-2026-5164 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5164 being exploited in the wild.

**How severe is CVE-2026-5164?** Medium severity, with a CVSS score of 6.7, published 30 March 2026.

**Which products and versions are affected?** Redhat Enterprise Linux, Redhat Virtio-Win. The advisory does not name versions.

**Is there a fix for CVE-2026-5164?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-5164?** Check whether you run Redhat Enterprise Linux or Redhat Virtio-Win. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Redhat Enterprise Linux
- Redhat Virtio-Win

## Related threats

- [GIMP file-pix plugin stack overflow in PIX image processing](https://junglewise.ai/threats/cve-2026-78475-gimp-file-pix-plugin-stack-overflow-in-pix-image-processing)
- [A flaw was found in Samba's CTDB, the clustered database service used by Samba. Insufficient integrity validation of…](https://junglewise.ai/threats/cve-2026-58224-a-flaw-was-found-in-samba-s-ctdb-the-clustered-database-service)
- [A flaw was found in sblim-cmpi-base. Insecure temporary file creation in the provider registration scripts allows a…](https://junglewise.ai/threats/cve-2026-73585-a-flaw-was-found-in-sblim-cmpi-base-insecure-temporary-file)
- [A flaw was found in sblim-sfcb. A local, low-privileged attacker can exploit a race condition during privileged…](https://junglewise.ai/threats/cve-2026-73584-a-flaw-was-found-in-sblim-sfcb-a-local-low-privileged-attacker)
- [A flaw was found in sblim-sfcb. A local attacker with access to the system can exploit an unsafe deserialization…](https://junglewise.ai/threats/cve-2026-73583-a-flaw-was-found-in-sblim-sfcb-a-local-attacker-with-access-to)