CVE-2026-22851

Publication date 14 January 2026

Last updated 18 March 2026

Ubuntu priority

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
freerdp	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
freerdp2	25.10 questing	Not in release
	25.04 plucky	Ignored end of life, was needs-triage
	24.04 LTS noble	Needs evaluation
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
freerdp3	25.10 questing	Fixed 3.16.0+dfsg-2ubuntu0.3
	25.04 plucky	Ignored end of life, was needs-triage
	24.04 LTS noble	Fixed 3.5.1+dfsg1-0ubuntu1.4
	22.04 LTS jammy	Not in release

Notes

mdeslaur

The commit below fixes the issue in client/SDL/SDL3/sdl_freerdp.cpp but the code in client/SDL/SDL2/sdl_freerdp.cpp is similar, but perhaps with a smaller window. Asked about SDL2 in https://github.com/FreeRDP/FreeRDP/pull/12103/

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
freerdp3	Upstream: 98deec9

References

Related Ubuntu Security Notices (USN)

USN-8105-1
FreeRDP vulnerabilities
18 March 2026