VirtualBox 5.2.8 has been released. Have you upgraded?

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Released: VirtualBox 5.2.8.121009

Changelog:
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VirtualBox 5.2.8 (released 2018-02-27)

This is a maintenance release. The following items were fixed and/or added:

• VMM: added support for FSGSBASE, PCID, INVPCID CPU features for guests
• VMM: fixed EMM386 issue with detecting suitable page frame base (bug #10022)
• Front end: Linux: prevent VM window from jumping and auto-resizing to tiny size after resizing it on HiDPI screen
• Front end: Linux: fixed seamless regression caused by wm_class functionality
• Front end: switched to https downloads
• Front end: fixed crash while opening New machine wizard (s.a. forums topic 86592)
• Audio: added support for distinguishing recording sources in the PulseAudio mixer on the host when multiple VMs are running
• Audio: various fixes for the DirectSound backend
• Video recording: added better file seeking support and fixed playback of recorded files with certain players (e.g. Firefox)
• Audio: various fixes for Windows guest surround setups
• Audio: various fixes for HDA emulation
• Serial: fixed an issue where the serial port parameters in the emulation and host serial port got out of sync
• Storage: fixed overwriting certain INQUIRY data for the DVD/CD drive attached to a AHCI controller
• Storage: fixed handling VMDK images created by Amazon EC2 VM export
• Network: fixed PXE boot regression in e1000
• Network: Added a workaround for older guests which do not enable bus mastering for the virtio PCI device
• 3D: add environment variable to configure presenting 3D content on main thread
• Windows hosts: fixed indiscriminate binding of NDIS5 bridged driver, that caused PPPOE malfunction
• Windows guests: fixed incorrect function error when using shared folders in certain applications (bug #14118)
• Linux guests: Linux 4.15 support (bugs #17311, #17320, #17282)
• Linux guests: fixed black screen when 3D enabled in guests
• Linux guests: suppress setuid and setgid in shared folders

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Source: Changelog – Oracle VM VirtualBox
Download: Oracle VM VirtualBox