Currently running XenApp 6.5 hotfix rollup 7 and has observed BSOD at least once a day in  the XenApp 6.5 worker servers.

The most recent bugcheck is a 0x000000ab SESSION_HAS_VALID_POOL_ON_EXIT. ntoskrnl.exe ntoskrnl.exe+3e515f fffff800`02218000 fffff800`027fb000 0x005e3000 0x5aa1f203 3/8/2018 10:31:31 PM Microsoft® Windows® Operating System NT Kernel & System 6.1.7601.24059 (win7sp1_ldr_escrow.180308-1637) Microsoft Corporation C:\Windows\system32\ntoskrnl.exe
The server 2008 R2 OS is up to date with the exception of two optional updates. Event logs do not have any errors just prior to the crashes.

This issue is also observed in later version of XenApp 7.15 as well.

Uninstalling the Microsoft KB4088875  stops the BSOD from occurring
OR
Follow this sequence for proper sequence of installation:
Before installing KB4088875, this KB must be installed: KB4099950 
After installing KB4088875 this KB must be installed: KB4100480
After installing KB4088875 this KB must be installed: KB4099467  to prevent the "SESSION_HAS_VALID_POOL_ON_EXIT (ab)" BSOD

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Problem Cause

Installation of KB4088875 on March 14th, 2018 caused the BSOD: "SESSION_HAS_VALID_POOL_ON_EXIT (ab)" 
Other facts to be aware:
Before installing KB4088875, this KB must be installed: KB4099950 
After installing KB4088875 this KB must be installed: KB4100480
After installing KB4088875 this KB must be installed: KB4099467

 

After installing Windows updates on March 14th, 2018 end users ar facing BSOD with error: "SESSION_HAS_VALID_POOL_ON_EXIT (ab)"

​https://support.microsoft.com/en-us/help/4088875/windows-7-update-kb4088875 - March 13, 2018—KB4088875 (Monthly Rollup) Removal of this hotfix mitigated the issue
https://support.microsoft.com/en-us/help/4099467/stop-error-0xab-when-you-log-off-a-windows-7-sp1-or-windows-server-200 - To resolve: SESSION_HAS_VALID_POOL_ON_EXIT (ab) BSOD
https://support.microsoft.com/en-us/help/4099950/nic-settings-are-replaced-or-static-ip-address-settings-are-lost-after - Pre-Requisite hotfix for KB4088875
https://support.microsoft.com/en-us/help/4100480/windows-kernel-update-for-cve-2018-1038 - Post KB4088875 recommended hotfix:
https://support.microsoft.com/en-us/hotfix/kbhotfix?kbnum=2585233&kbln=en-US - This hotfix also fixes an issue that matches the error description but was not used for this case resolution