CVE-2021-20292: Debian Linux

Medium severity, CVSS 6.7. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 9.0 only
• Fedoraproject Fedora: version 33 only
• Linux Linux Kernel: from 3.3, before 4.9.298 (fixed in 4.9.298); from 4.10, before 4.14.263 (fixed in 4.14.263); from 4.15, before 4.19.140 (fixed in 4.19.140); from 4.20, before 5.4.59 (fixed in 5.4.59); from 5.5, before 5.7.16 (fixed in 5.7.16); from 5.8, before 5.8.2 (fixed in 5.8.2)
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only

Published 2021-05-28. Last modified 2026-06-17.