[German]Beware, there are initial reports here on the blog that cumulative updates KB5000802 and KB5000808 from March 9, 2021 for Windows 10 (1909 – 20H2) is causing BlueScreen in win32kfull.sys when printing.
Update KB5000802/KB5000808 for Windows 10 1909 – 20H2
I covered a few hours ago the updates for Windows 10 and the Server pendants within my blog post Patchday: Windows 10-Updates (March 9, 2021). The description from Microsoft states that these update also fixes the vulnerability CVE-2021-1640. This vulnerability allows elevation of privilege related to print jobs submitted to "FILE:" ports. Microsoft patched around this vulnerability back in December 2020.
Microsoft states that after installing Windows update KB5000802 or KB5000808, dated March 9, 2021, print jobs that are in a pending state will remain in the error state before the print spooler service is restarted or the operating system is restarted. There is a tip to manually delete the affected print jobs, and resubmit them to the print queue when the print spooler service is online.
Are the updates already pulled?
In the comments to the Germany blog post Patchday: Windows 10-Updates (9. März 2021), users report that the update is not offered (anymore).
The update described here has not yet been offered on my machine. [Still on] version 20H2 Build: 19042.844
Same for me. No KB5000802. Windows 10 version 20H2 remains on 19042.844!
are typical comments and a user asks if the update KB5000802 is already withdrawn. I did a quick search, but so far I haven't found anything – the KB article for KB5000802 doesn't know anything about it yet and the Microsoft Update Catalog also offers the update.
In the TensForum I only found the notes that the update does not download or brings errors and the progress bar during the update installation no longer shows percentages. The colleagues from German site Deskmodder had pointed out a few days ago that Microsoft (as part of its product optimization) removed the percentages from the progress bar during update installation.
Blue Screens when printing in win32kfull.sys
Users of Windows 10 version 1909, 2004 or 20H2 should urgently activate the update delay for 7 days and I recommend that administrators in managed enterprise environments should not release the march 2021 updates like KB5000802 without extensive tests. I got massive feedback, that these updates are causing blue screens in win32kfull.sys during printing. Its reported for update KB5000802 (2004/20H2)as well for update KB5000808 (v1909). A workaround to test is to uninstall the printer driver and reinstall it, to solve the printing bsod issue. Here is the first message from my German blog.
We have the problem that after today's updates several W10 (1909,2004,20H2) – clients go into a BlueScreen when printing especially to Kyocera printers.
win32kfull.sys is probably reported in the BSOD.
Causing update KB5000802 + KB5000808
After Updateeinstallation and reinstallation of the printer brought then success.
Now there are now more and more users confirming that behavior in comments within my German blog. Another user reported that for a label printer.
After the 2021-3 update, a customer had bluescreens (win32kfull.sys) when trying to print on his label printers (Seagull brand). Other printers worked without problems. An update of the printer drivers was the solution.
Thanks to the commenters, maybe the information will help.
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