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Software & More => Computer Problems, Questions and Solutions! => Topic started by: Corrine on August 02, 2019, 03:47:15 PM

Title: Servicing Stack Updates (SSU)
Post by: Corrine on August 02, 2019, 03:47:15 PM
Servicing Stack Updates (SSU) seem to cause a lot of confusion.  Users see posts mentioning a SSU update but when viewing Update History, only the latest Cumulative Update is listed.  So, what is the Servicing Stack and why are the updates important?

What is the Servicing Stack?

Simply stated, the Servicing Stack is what actually installs Windows Updates.  However, it also contains the "component-based servicing stack" (CBS).  The CBS is key to DISM, SFC, as well as changing Windows features or roles, and repairing components.

Why are the SSU Updates Important?

The Microsoft Docs article referenced below explains the importance of SSU's as follows:

Quote
"Servicing stack updates improve the reliability of the update process to mitigate potential issues while installing the latest quality updates and feature updates. If you don't install the latest servicing stack update, there's a risk that your device can't be updated with the latest Microsoft security fixes."

As an example of a SSU update, following are the issues addressed in the July 26, 2019 Servicing Stack Update for Windows 10, 1903 (https://support.microsoft.com/en-us/help/4508433/windows-10-update-kb4508433) x64-based Systems:Getting the SSU:

When there is a Servicing Stack Update released with security or cumulative updates, the updates are automatically installed with Windows Update (you won't see the SSU offered in the list of updates available).  Because each Servicing Stack Update replaces the complete "stack" they do not require a restart.

If you are unsure whether you have the latest Servicing Stack Updates installed, the list of SSU's is at https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/ADV990001 (https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/ADV990001).  Locate the update for your operating system.  Clicking the KB number will take you to the update, which includes the date of the last update.  You can now find the date of the last update on your device in the link to "View installed updates" located in Programs and Features of the Control Panel.

References: