---
id: CVE-2026-5164
title: >-
  Virtio-win: virtio-win: denial of service via unvalidated descriptor count in
  unmap request
summary: >-
  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
  …
severity: medium
cvss: 6.7
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-120
vendor: Red Hat
product: virtio-win
affected:
  - virtio-win (all versions)
  - virtio-win
  - virtio-win (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-03-30T15:19:30.452989Z'
published: '2026-03-30'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:17:52.506Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-5164'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-5164'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2453014'
    label: RHBZ#2453014
  - url: 'https://github.com/virtio-win/kvm-guest-drivers-windows/pull/1504'
tags:
  - cve.org
epss: 0.00114
epssPercentile: 0.01472
ingestedAt: '2026-11-05T22:38:32.037Z'
---

## Overview

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).

## Affected

- `virtio-win (all versions)`
- `virtio-win`
- `virtio-win (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.