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

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
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.

virtio-win是virtio-win开源的一个虚拟机模拟软件。 virtio-win存在安全漏洞，该漏洞源于RhelDoUnMap函数未正确验证用户提供的描述符数量，可能导致缓冲区溢出和拒绝服务。

CVSS 6.7 · Medium EPSS 0.16% · P4
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I. Basic Information for CVE-2026-5164

Vulnerability Information
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Vulnerability Title
Virtio-win: virtio-win: denial of service via unvalidated descriptor count in unmap request
Source: CVE Program / CVE List V5
Vulnerability Description
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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
virtio-win 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
virtio-win是virtio-win开源的一个虚拟机模拟软件。 virtio-win存在安全漏洞，该漏洞源于RhelDoUnMap函数未正确验证用户提供的描述符数量，可能导致缓冲区溢出和拒绝服务。
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
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-5164

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III. Intelligence Information for CVE-2026-5164

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Patches & Fixes for CVE-2026-5164 (1)

Vendor Advisories for CVE-2026-5164 (2)

Same Patch Batch · Red Hat · 2026-03-30 · 4 CVEs total

CVE-2026-5121 7.5 HIGH Libarchive: libarchive: arbitrary code execution via integer overflow in iso9660 image pro
CVE-2026-5165 6.7 MEDIUM Virtio-win: virtio-win: memory corruption via use-after-free in virtio blk device reset
CVE-2026-5119 5.9 MEDIUM Libsoup: libsoup: information disclosure via cleartext transmission of cookies during http

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-120

V. Comments for CVE-2026-5164

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