This is a maintenance release. The following items were fixed and/or added:
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GUI: show actual VM uptime in the session information window
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Audio: re-enabled speakers for Mac OS X guests (5.1.0 regression; bug #15611)
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Audio: fixed crashes under certain conditions
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USB: fixed a hang under certain conditions
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USB: fixed a hanging guest under certain conditions (bug #15747)
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PIIX4: implemented dummy SMBus controller to prevent annoying Linux kernel warnings about uninitialized SMBus base address (bug #9517)
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NVMe: several fixes to improve stability, fixed a crash while saving a VM state
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VMDK: fixed an issue creating fixed size images with certain sizes and the Split2G option enabled (bug #15748)
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VHDX: fixed cloning images with VBoxManage clonehd (bug #14288)
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Storage: fixed broken bandwidth limitation when the limit is very low (bug #14982)
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EFI: fixed sending debug messages in the EFI firmware if a serial port is enabled (bug #12161)
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OVF: when importing appliances, make sure that the version of the embedded VirtualBox specific settings is processed, to get the default settings handling right
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VBoxManage: Don't try to set the medium type if there is no change (bug #13850)
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Linux installer: fixed some scripting issues (bugs #15701 and #15702)
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Linux installer: fixed a path issue on certain Linux distributions (bug #15717)
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Windows hosts: fixed corrupted mouse pointers with some Linux and Solaris guests (bug #15665)
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Linux Additions: made the video driver work on 32-bit guests with large video memory sizes (bug #15621)
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Linux Additions: made the video driver work on kernel 4.7 and later (bug #15769)
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Linux Additions: converted a failure message to an informational one when drivers could not be stopped during upgrade (bug #15692)
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Linux Additions: made the video driver work around an X server bug which cause screen refresh to stop (bug #15511)
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Windows Additions: auto-resizing fixes for Windows 10 guests (bug #15257)
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Windows Additions: fixed VBoxTray problems with Windows 2000 (bug #15661)