Some users ability be faced with the botheration in which the LSAISO.exe (LSA Isolated) action adventures aerial CPU acceptance on a Windows 10 computer. The action is associated with Credential Guard & Key Guard. In this post, we accept a attending at the accessible account and the recommended band-aid to this issue.
VSM uses abreast modes that are accepted as Virtual Trust Levels (VTL) to assure IUM processes (also accepted as trustlets). IUM processes such as LSAISO run in VTL1 while added processes run in VTL0. The anamnesis pages of processes that run in VTL1 are adequate from any awful cipher that is active in VTL0.
The Bounded Aegis Authority Subsystem Service (LSASS) action is amenable for managing the bounded arrangement policy, user authentication, and auditing while it additionally handled acute aegis abstracts such as countersign hashes and Kerberos keys.
To use the aegis allowances of VSM, the LSAISO trustlet that runs in VTL1 communicates through an RPC approach with the LSAISO action that is active in VTL0. The LSAISO secrets are encrypted afore they are beatific to LSASS, and the pages of LSAISO are adequate from any awful cipher that is active in VTL0.
Possible account of LSAISO action aerial CPU usage
In Windows 10, the LSAISO action runs as an Isolated User Mode (IUM) action in a new aegis ambiance that is accepted as Virtual Secure Mode (VSM).
Applications and drivers that try to amount a DLL (Dynamic Link Library) into an IUM process, inject a thread, or bear a user-mode APC may destabilize the absolute system. This destabilization can activate the aerial LSAISO CPU acceptance in Windows 10.
How to fix LSAISO action aerial CPU acceptance issue
To boldness this issue, Microsoft recommends application one of the afterward methods.
Now, let’s burrow into capacity for the two recommended solutions.
1] Use the action of elimination
It is accepted for some applications (such as antivirus programs) to inject DLLs or chain APCs to the LSAISO process. This causes the LSAISO action to acquaintance aerial CPU usage.
In this scenario, the “process of elimination” troubleshooting adjustment requires that you attenuate applications and drivers until the CPU fasten is mitigated. After you actuate which software is causing the problem, acquaintance the bell-ringer for a software update.
2] Check for queued APCs
In this scenario, you’ll charge to aboriginal download the chargeless Windows Debugging (WinDbg) tool. The apparatus is additionally included in the Windows Disciplinarian Kit (WDK).
Once you accept the WinDbg apparatus downloaded, you can again advance with the accomplish categorical beneath to actuate which disciplinarian is queuing an APC to LSAISO.
The action is as follows:
Note: A complete anamnesis dump is not recommended because it would crave decryption if VSM is enabled on the system.
To accredit the atom dump, do the following:
2. Bang the Start button, locate and bang Windows Kits access on the Start menu, again baddest WinDbg(x64/x86) to barrage the tool.
3. On the File menu, click Symbol Book Path, add the abode aisle beneath for the Microsoft Symbol Server to the Symbol aisle field, and bang OK.
https://msdl.microsoft.com/download/symbols
4. Next, on the File menu, click Open Crash Dump.
5. Browse to the area of the atom dump book that you acclaimed in footfall 1, and again baddest Open. Check the date on the .dmp book to accomplish abiding that it was anew created during this troubleshooting session.
6. In the Command window, type !apc, hit Enter.
You’ll accept a agnate achievement as apparent below.
7. Search the after-effects for LsaIso.exe. If a disciplinarian that is called “<ProblemDriver>.sys” is listed beneath LsaIso.exe, as apparent in the achievement aloft – acquaintance the vendor, and again accredit them to this Microsoft certificate for the recommended acknowledgment for the Isolated User Mode (IUM) processes.
If no drivers are listed beneath Lsaiso.exe, this agency that the LSAISO action has no queued APCs.
That’s it!
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