CVE-2021-20292

There is a flaw reported in the Linux kernel in versions before 5.9 in
drivers/gpu/drm/nouveau/nouveau_sgdma.c in nouveau_sgdma_create_ttm in
Nouveau DRM subsystem. The issue results from the lack of validating the
existence of an object prior to performing operations on the object. An
attacker with a local account with a root privilege, can leverage this
vulnerability to escalate privileges and execute code in the context of the
kernel.

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