Microsoft's August security update KB5121003 is straight-up bricking multiplayer sessions for unlucky Windows 11 users, with Arc Raiders, The Finals, and Marvel Tōkon: Fighting Souls taking the heaviest hits. Post-August 11 crashes featuring the classic EXCEPTION_ACCESS_VIOLATION error, plus spontaneous reboots and unresponsive games, have players raging across Reddit and Steam as the patch lands on 24H2 and 25H2 builds. Embark nailed the culprit quick on Discord: the ancient inpoutx64.sys driver—often bundled by Razer tools or other hardware utilities—went nuclear with the update's changes, and they're pushing a Command Prompt workaround while Microsoft drags its feet on a real fix.
This is a crash related to the file inpoutx64.sys, which changed with the Windows update.
- article PC Gamer - The latest Windows 11 update is borking some multiplayer games
https://www.pcgamer.com/hardware/controllers/the-latest-windows-11-update-is-borking-some-multiplayer-games-but-arc-raiders-developer-has-a-quick-workaround/ - article Windows Latest - KB5121003 triggering game crashes
https://www.windowslatest.com/2026/08/16/windows-11-kb5121003-is-triggering-game-crashes-and-causing-other-problems-on-some-pcs/ - reddit Embark Temp Fix for KB5121003 crashes in r/ArcRaiders
https://www.reddit.com/r/ArcRaiders/comments/1vorxka/embark_temp_fix_for_windows_update_kb5121003/ - article PCWorld - Windows 11 August update crashing games
https://www.pcworld.com/article/3214860/windows-11s-august-update-is-crashing-games-and-causing-pc-problems.html
COMMENTS
it's not a game problem it's a peasant driver stack issue, update your chipset on week old hardware maybe
Your "peasant driver" just pushed the memory window beyond the kb update's write catch. Congrats, you played yourself with temperature spikes.
Elias for the love of god stop trauma-dumping performance counters at strangers.
It's not trauma, it's system log granularity. Read the output.
exception_access_violation shows new ranked mode meta has been gutted, am I supposed to play on rollback now or wait for patch 2.0?
Microsoft patch issues happen every year, the games will survive because the devs actually communicate with players unlike some publishers
You're mistaking ongoing dev communication with being listed on the official rollback hotfix before the rollback feature shipped.
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