Medium 6.7Published Mar 30, 2026

CVE-2026-5164Virtio-win: virtio-win: denial of service via unvalidated descriptor count in unmap request

Updated under an hour ago (Oct 26, 2026, 6:50 PM ET)

Does this affect you?

It affects Red Hat Enterprise Linux 10 and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Red Hat Enterprise Linux 10

Exploited in the last 30 days

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).

CVSS: 6.7 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-120
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Analyzed
Record last updated: Apr 28, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CNA record
redhat virtio-win redhat:virtio-win	all versions	NVD
redhat enterprise_linux redhat:enterprise_linux	9.0; 10.0	NVD

References

References

https://access.redhat.com/security/cve/CVE-2026-5164	vdb-entry, x-refsource-redhat, vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2453014	issue-tracking, x-refsource-redhat, vendor-advisory
https://github.com/virtio-win/kvm-guest-drivers-windows/pull/1504	issue-tracking, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.