Cmuda.sys file information
The process known as C-Media Audio WDM Driver belongs to software C-Media WDM Audio Interface by C-Media (www.cmedia.com.tw).
Description: Cmuda.sys is not essential for the Windows OS and causes relatively few problems. The file cmuda.sys is located in the C:\Windows\System32\drivers folder.
Known file sizes on Windows 10/8/7/XP are 1,373,120 bytes (60% of all occurrences), 805,440 bytes or 1,332,544 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs.
The program has no visible window. There is no detailed description of this service. The file is not a Windows system file. Cmuda.sys is a Microsoft signed file.
cmuda.sys appears to be a compressed file.
Therefore the technical security rating is 19% dangerous; however you should also read the user reviews.
Recommended: Identify cmuda.sys related errors
Important: Some malware disguises itself as cmuda.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the cmuda.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.
Best practices for resolving cmuda issues
A clean and tidy computer is the key requirement for avoiding problems with cmuda. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.
Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
To help you analyze the cmuda.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.
Other processes
imjpcic.dll officeagent.exe mcvulctr.exe cmuda.sys wbsrv.exe upsmon.exe svchost viewer.exe port_nt.sys siteranktray.exe msismbservice.exe smartnotifications.exe [all]
Score
User Comments
Georg
Hungry Wolf
da
Jim
WickerMan
coolo
Eugen Cernat
chris ogloff
schonlau
dsrone969 (further information)
twilli811
Max
DriverX
Summary: Average user rating of cmuda.sys: based on 38 votes with 17 user comments. 27 users think cmuda.sys is essential for Windows or an installed application. 10 users think it's probably harmless. One user suspects danger. 4 users don't grade cmuda.sys ("not sure about it").