CVE-2026-5164: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Red Hat Red Hat Enterprise Linux 10
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).
AI Analysis
Technical Summary
This vulnerability in Red Hat Enterprise Linux 10 involves improper input validation in the RhelDoUnMap() function of the virtio-win driver. Specifically, the function fails to check the size of the input descriptor list during an unmap request, allowing a local user to trigger a buffer overflow by providing too many descriptors. This can result in a system crash and denial of service. The CVSS 3.1 vector indicates the attack requires local access with high privileges and no user interaction, with impacts on confidentiality, integrity, and availability.
Potential Impact
Exploitation of this vulnerability can cause a denial of service through a system crash. The attacker must have local access with high privileges. There is no indication of remote exploitation or data breach. The impact is limited to availability and potentially system stability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory at https://access.redhat.com/security/cve/CVE-2026-5164 for current remediation guidance. Until an official fix is available, restrict local access to trusted users with high privileges to reduce risk.
CVE-2026-5164: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Red Hat Red Hat Enterprise Linux 10
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).
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Red Hat Enterprise Linux 10 involves improper input validation in the RhelDoUnMap() function of the virtio-win driver. Specifically, the function fails to check the size of the input descriptor list during an unmap request, allowing a local user to trigger a buffer overflow by providing too many descriptors. This can result in a system crash and denial of service. The CVSS 3.1 vector indicates the attack requires local access with high privileges and no user interaction, with impacts on confidentiality, integrity, and availability.
Potential Impact
Exploitation of this vulnerability can cause a denial of service through a system crash. The attacker must have local access with high privileges. There is no indication of remote exploitation or data breach. The impact is limited to availability and potentially system stability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory at https://access.redhat.com/security/cve/CVE-2026-5164 for current remediation guidance. Until an official fix is available, restrict local access to trusted users with high privileges to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-03-30T14:47:34.383Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-5164","vendor":"Red Hat"}]
Threat ID: 69ca9568e6bfc5ba1d43cfd6
Added to database: 3/30/2026, 3:23:20 PM
Last enriched: 4/29/2026, 10:32:39 AM
Last updated: 5/15/2026, 4:09:35 AM
Views: 86
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