CVE-2026-5164 | virtio-win kvm-guest-drivers-windows RhelDoUnMap buffer overflow

VDB-354198 · CVE-2026-5164 · GCVE-0-2026-5164 VIRTIO-WIN KVM-GUEST-DRIVERS-WINDOWS RHELDOUNMAP BUFFER OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.6 $0-$5k 1.57+ Summaryinfo A vulnerability described as critical has been identified in virtio-win kvm-guest-drivers-windows. This impacts the function RhelDoUnMap. The manipulation results in buffer overflow. This vulnerability was named CVE-2026-5164. The attack needs to be approached locally. There is no available exploit. It is best practice to apply a patch to resolve this issue. Detailsinfo A vulnerability, which was classified as critical, was found in virtio-win kvm-guest-drivers-windows (unknown version). Affected is the function RhelDoUnMap. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes: 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). The advisory is available at access.redhat.com. This vulnerability is traded as CVE-2026-5164 since 03/30/2026. The exploitability is told to be easy. Local access is required to approach this attack. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but there is no available exploit. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. Productinfo Type Hardware Driver Software Vendor virtio-win Name kvm-guest-drivers-windows Website Product: https://github.com/virtio-win/kvm-guest-drivers-windows/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.7 VulDB Meta Temp Score: 6.6 VulDB Base Score: 6.7 VulDB Temp Score: 6.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 6.7 CNA Vector (redhat): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Buffer overflow CWE: CWE-120 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: No Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Patch Status: 🔍 0-Day Time: 🔒 Patch: github.com Timelineinfo 03/30/2026 Advisory disclosed 03/30/2026 +0 days CVE reserved 03/30/2026 +0 days VulDB entry created 03/30/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: access.redhat.com Status: Confirmed CVE: CVE-2026-5164 (🔒) GCVE (CVE): GCVE-0-2026-5164 GCVE (VulDB): GCVE-100-354198 Entryinfo Created: 03/30/2026 17:30 Changes: 03/30/2026 17:30 (64) Complete: 🔍 Cache ID: 99:A87:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸