Bug 2447385 (CVE-2026-31884) - CVE-2026-31884 freerdp: FreeRDP has a division-by-zero in ADPCM decoders when `nBlockAlign` is 0
Summary: CVE-2026-31884 freerdp: FreeRDP has a division-by-zero in ADPCM decoders when...
Keywords:
Status: NEW
Alias: CVE-2026-31884
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2447419 2447422 2447430
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-13 18:04 UTC by OSIDB Bzimport
Modified: 2026-03-13 19:45 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-03-13 18:04:22 UTC 
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, division by zero in MS-ADPCM and IMA-ADPCM decoders when nBlockAlign is 0, leading to a crash. In libfreerdp/codec/dsp.c, both ADPCM decoders use size % block_size where block_size = context->common.format.nBlockAlign. The nBlockAlign value comes from the Server Audio Formats PDU on the RDPSND channel. The value 0 is not validated anywhere before reaching the decoder. When nBlockAlign = 0, the modulo operation causes a SIGFPE (floating point exception) crash. This vulnerability is fixed in 3.24.0.
Note You need to log in before you can comment on or make changes to this bug.