CVE-2024-46710

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/vmwgfx: Prevent unmapping active read buffers<br /> <br /> The kms paths keep a persistent map active to read and compare the cursor<br /> buffer. These maps can race with each other in simple scenario where:<br /> a) buffer "a" mapped for update<br /> b) buffer "a" mapped for compare<br /> c) do the compare<br /> d) unmap "a" for compare<br /> e) update the cursor<br /> f) unmap "a" for update<br /> At step "e" the buffer has been unmapped and the read contents is bogus.<br /> <br /> Prevent unmapping of active read buffers by simply keeping a count of<br /> how many paths have currently active maps and unmap only when the count<br /> reaches 0.