Applies to: Windows 8.1, Windows Server 2012 R2 Standard
Improvements and fixes
This security update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:
- Addresses issue where customers sometimes can't sign in to Windows 2012 R2 servers when using a custom credential provider on a console or RDP.
- Provides cumulative Spectre and Meltdown protections for 32-Bit (x86) and 64-Bit (x64) versions of Windows except the KB4078130 update that was offered to disable mitigation against Spectre Variant 2.
- Security updates to the Microsoft Graphics component, Windows Kernel, Windows Shell, Windows MSXML, Windows Installer, and Windows Hyper-V.
Known issues in this update
Because of an issue that affects some versions of antivirus software, this fix applies only to computers on which the antivirus ISV updated the ALLOW REGKEY.
Contact your antivirus manufacturer to verify that their software is compatible and that they have set the following REGKEY on the computer:
How to get this update
This update is now available for installation through WSUS. To get the standalone package for this update, go to the Microsoft Update Catalog website.
For a list of the files that are provided in this update, download the file information for update 4088879.
Direct download links for KB4088879 MSU file from Microsoft Update Catalog:
Download KB4088879 MSU for Windows 8.1 32-bit (x86) - 18.7 MB
Download KB4088879 MSU for Windows 8.1 64-bit (x64) - 28.0 MB
- 64-bit Windows 10
- Computer type
- System Manufacturer/Model Number
- Custom self built
- Intel i7-3930K 3.2 Ghz (O/C to 4 Ghz)
- ASRock X79 Extreme11
- 32 GB (8GBx4) G.SKILL DDR3 Quad PC3-19200 2400 MHz
- Graphics Card(s)
- ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
- Sound Card
- SB Recon 3Di Integrated Chip
- Monitor(s) Displays
- 3 x 27" Asus VE278Q
- Screen Resolution
- Hard Drives
256GB OCZ Vector
6TB WD Black WD6001FZWX
- OCZ Series Gold OCZZ1000M 1000W
- Corsair Air 740
- Corsair Hydro H115i
- Logitech wireless K800
- Logitech MX Master
- Internet Speed
- 100 Mb/s Download and 10 Mb/s Upload
- Internet Explorer 11
- Malwarebyte Anti-Malware Premium
- Other Info
Lite-On iHBS212 12x BD Writer
Creative F200 webcam
Samsung CLX-3175FW Printer
Linksys EA9500 Router
Arris SB6190 Cable Modem
APC SMART-UPS RT 1000 XL