CVE-2026-22851— FreeRDP RDPGFX ResetGraphics race leads to use-after-free in SDL client (sdl->primary)
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I. Basic Information for CVE-2026-22851
Vulnerability Information
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Vulnerability Title
FreeRDP RDPGFX ResetGraphics race leads to use-after-free in SDL client (sdl->primary)
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeRDP 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.20.1之前版本存在资源管理错误漏洞，该漏洞源于RDPGFX动态虚拟通道线程和SDL渲染线程之间的竞争条件，可能导致堆释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-22851
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Same Patch Batch · FreeRDP · 2026-01-14 · 9 CVEs total
| CVE-2026-22852 | FreeRDP has a heap-buffer-overflow in audin_process_formats | |
| CVE-2026-22853 | FreeRDP has a heap-buffer-overflow in ndr_read_uint8Array | |
| CVE-2026-22854 | FreeRDP has a heap-buffer-overflow in drive_process_irp_read | |
| CVE-2026-22857 | FreeRDP has a heap-use-after-free in irp_thread_func | |
| CVE-2026-22855 | FreeRDP has a heap-buffer-overflow in smartcard_unpack_set_attrib_call | |
| CVE-2026-22858 | FreeRDP has a global-buffer-overflow in crypto_base64_decode | |
| CVE-2026-22856 | FreeRDP has a heap-use-after-free in create_irp_thread | |
| CVE-2026-22859 | FreeRDP has a heap-buffer-overflow in urb_select_configuration |
IV. Related Vulnerabilities
Same product: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Same vendor: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
V. Comments for CVE-2026-22851
Anonymous User
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