CVE-2026-22851

FreeRDP RDPGFX ResetGraphics race leads to use-after-free in SDL client (sdl->primary)

State: Published
Severity: 6.9 Medium
Published: Jan 14, 2026
Updated: Jan 14, 2026
Reserved: Jan 12, 2026

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race condition between the RDPGFX dynamic virtual channel thread and the SDL render thread leads to a heap use-after-free. Specifically, an escaped pointer to sdl->primary (SDL_Surface) is accessed after it has been freed during RDPGFX ResetGraphics handling. This vulnerability is fixed in 3.20.1.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P	GitHub_M

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416 Use After Free

Affected Products

Product	Versions
FreeRDPFreeRDP	< 3.20.1Affected

References

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