Medium [CVE-2026-63117] Denial of Service via ADPCM frame size calculation
This medium-severity Red Hat Linux advisory covers CVE-2026-63117 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
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Summary
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, an authenticated RDP client can advertise DVI ADPCM with nBlockAlign equal to 8 and nChannels equal to 2 to make the `bs` calculation in rdpsnd_server_select_format in channels/rdpsnd/server/rdpsnd_main.c equal zero.
The subsequent out_frames modulo `bs` operation raises SIGFPE and terminates the server-side rdpsnd channel process. This vulnerability fixed in 3.28.0.
An authenticated Remote Desktop Protocol (RDP) client can trigger a denial of service by sending a specially crafted DVI ADPCM frame. By advertising specific nBlockAlign and nChannels values, a division-by-zero error occurs in the rdpsnd_server_select_format function.
This vulnerability leads to the termination of the server-side rdpsnd channel process, causing a denial of service. A divide-by-zero flaw was found in FreeRDP's `rdpsnd` audio channel server implementation.
An authenticated remote RDP client can send malformed DVI ADPCM audio parameters (`nBlockAlign=8`, `nChannels=2`) during format selection in `rdpsnd_server_select_format`. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-369. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
- < 3.28.0
Official advisory · high-confidence parse· fetched 17 days ago·verify at source
Mitigation checklist
- To mitigate this issue, administrators can disable audio redirection on the FreeRDP server configuration if remote audio support is not strictly required.
Official advisory · high-confidence parse· fetched 17 days ago·verify at source
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