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    ChromeOS LTS-150 Update Patches Six Critical Security Flaws On Long-Term Support Chromebooks

    WilliamBy No Comments3 Mins Read

    Google is rolling out ChromeOS LTS-150 version 150.0.7871.289 (platform version 16700.70.0) to most devices on the Long-Term Support channel. That’s the slower update track schools and businesses can choose for their managed Chromebooks. The release is dated November 11, 2026 and adds no new features: it lists 62 security fixes, and six of them carry Google’s highest severity rating, Critical.

    ChromeOS LTS-150 Update Patches Six Critical Security Flaws On Long-Term Support Chromebooks

    What the update fixes

    Google’s Long Term Support Channel Update for ChromeOS calls its list a selection of fixes. All 56 non-Critical entries are rated High. Two of the Critical bugs are in Layout, the code that works out where everything on a web page sits, and both are use-after-free flaws, where software keeps using a piece of memory after giving it back, which an attacker can sometimes turn into a way to run their own code. That’s a common type of browser bug, and a serious one.

    The other four Critical fixes are spread across other components. They cover MediaStream, which handles camera and microphone access, plus FileSystem and WebRTC, the technology behind video calls in the browser. The last is a validation bug in FileAPI, the part that lets a website read a file you’ve picked. The post doesn’t say any of these flaws are being exploited.

    This is the second security refresh since LTS-150 arrived. The channel jumped from version 144 to 150 on October 6, and patch 150.0.7871.287 followed on October 26.

    Why Long-Term Support fleets get separate patches

    LTS freezes the ChromeOS feature set for six months and sends security fixes roughly every two weeks until the next LTS version comes out. That gives IT staff time to test their apps before anything changes on student or employee laptops. If you want to see how the channels compare, there’s a breakdown of ChromeOS update frequency across Stable, LTC and LTS.

    The stability has a cost. Google’s help page on Long-term Support says LTS only gets targeted fixes, and some critical patches can’t be carried back because the older code has moved too far from the current release. Those patches wait for the next major LTS version, which can mean a delay of up to nine months. So each LTS patch is worth installing quickly, because it’s the only way most fixes reach these devices.

    Personal Chromebooks aren’t affected. Only an administrator can put a device on LTS, so home users have nothing to do. Every LTS device still runs ChromeOS, and Google has said in its FAQ for administrators on Googlebook that ChromeOS will get updates and security patches through mid-2034. Google hasn’t yet named the newer commercial models that will be able to move to Googlebook OS.

    How IT staff can confirm the update landed

    The rollout reaches most devices over several days. To see which models already show the new LTS build, use this guide to the current ChromeOS version on every channel and model. To check your own fleet:

    1. In the Google Admin console, go to Devices > Chrome > Devices.
    2. Filter or sort the device list by OS version to find any device still below 150.0.7871.289.
    3. On a device that’s behind, open Settings > About ChromeOS and select Check for updates.
    4. Restart the device when the download finishes.

    William spent several years working in school IT, where he helped roll out and manage Chromebooks for students and staff. That experience shapes his writing at About Chromebooks, where he covers device management, enrollment, security settings, and troubleshooting for schools and businesses. He enjoys explaining the admin side of ChromeOS to people who suddenly find themselves responsible for a fleet of laptops.