The vmw_surface_define_ioctl function in drivers/gpu/drm/vmwgfx/vmwgfx_surface.c in the Linux kernel up to and including 4.10.6 does not validate addition of certain levels data, which allows local users to trigger an integer overflow and out-of-bounds write, and cause a denial of service (system hang or crash) or possibly gain privileges, via a crafted ioctl call for a /dev/dri/renderD* device.
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|---|---|---|
linux linux kernel |
Silently side-step software safeguards
Video Boffins in America, the Netherlands, and Switzerland have devised a Spectre-style attack on modern processors that can defeat defenses that are supposed to stop malicious software from hijacking a computer's operating system. The end result is exploit code able to bypass a crucial protection mechanism and take over a device to hand over root access. That's a lot to unpack so we'll start from the top. Let's say you find a security vulnerability, such as a buffer overflow, in the kernel of a...
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