CVE-2021-20292

Severity: medium (CVSS 6.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-28 · updated 2026-06-17
Weakness: CWE-416

Description

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 Linux: 9.0
Fedoraproject Fedora: 33
Linux kernel: from 3.3 before 4.9.298; from 4.10 before 4.14.263; from 4.15 before 4.19.140; from 4.20 before 5.4.59; from 5.5 before 5.7.16; from 5.8 before 5.8.2 — fixed in 4.14.263, 4.19.140, 4.9.298, 5.4.59, 5.7.16, 5.8.2
Red Hat Enterprise Linux: 6.0, 7.0

How to fix

Upgrade to a fixed version: Linux kernel 4.14.263, 4.19.140, 4.9.298, 5.4.59. Check the vendor advisory for mitigations.

References

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