An information disclosure vulnerability exists when the Windows Virtual PCI (VPCI) virtual service provider (VSP) fails to properly handle uninitialized memory. An attacker who successfully exploited this vulnerability could potentially disclose contents of memory to which the attacker should not have access.
To exploit the vulnerability, an attacker would first have to log on to the target system. An attacker could then run a specially crafted application that could exploit the vulnerability. The vulnerability would not allow an attacker to execute code or elevate user rights directly, but it could be used to obtain information that could be used to attempt to further compromise the affected system.
The update addresses the vulnerability by correcting VPCI memory handling.
## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows Server 2012 | | [KB3164294](https://patchblox.com/security/data/fix/microsoft/kb3164294.md) | Jun 14, 2016 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB3164294](https://patchblox.com/security/data/fix/microsoft/kb3164294.md) | Jun 14, 2016 | | Microsoft | Windows Server 2012 R2 | | [KB3164294](https://patchblox.com/security/data/fix/microsoft/kb3164294.md) | Jun 14, 2016 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB3164294](https://patchblox.com/security/data/fix/microsoft/kb3164294.md) | Jun 14, 2016 | --- Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.