There is no reliable public model-by-model answer. The available ChromeOS sources do not identify which Chromebook models or builds were affected by Dirty Pipe (CVE-2022-0847), or the ChromeOS release in which a fix shipped. Keep ChromeOS updated through its built-in updater; if you use a separate Linux environment, update that environment through its own supported tools. Upstream Linux version numbers alone cannot establish whether a Chromebook is vulnerable or patched.
What Dirty Pipe is—and what an attacker would need
Dirty Pipe is the name for CVE-2022-0847, a Linux kernel flaw. The National Vulnerability Database (NVD) says stale values could remain in a pipe buffer’s flags member because it was not properly initialized in copy_page_to_iter_pipe and push_pipe. A local, unprivileged user could exploit the flaw to write to page-cache pages backed by read-only files, potentially escalating privileges. NVD rates it High, with a CVSS 3.x base score of 7.8. NVD’s CVE-2022-0847 record describes the vulnerability and affected upstream kernel ranges.
CISA’s March 10, 2022 alert also characterizes Dirty Pipe as a local privilege-escalation vulnerability that could let a local attacker take control of an affected system. The cited guidance describes a need for local access; it does not describe Dirty Pipe itself as a remote browser compromise. CISA’s alert provides its security guidance.
Why Linux version numbers do not answer the Chromebook question
CISA reported the flaw in Linux kernel versions 5.8 and later and advised updating to 5.16.11, 5.15.25, or 5.10.102 and later. NVD lists the corresponding upstream affected ranges as 5.8 up to, but not including, 5.10.102; 5.15 up to, but not including, 5.15.25; and 5.16 up to, but not including, 5.16.11. Those boundaries describe upstream Linux branches, not a universal Chromebook test. Vendors and distributions can maintain different kernels and backport security fixes, so comparing a device’s kernel number with those boundaries does not by itself establish exposure or patch status.
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Ubuntu’s advisory explains that exploitation depends on two kernel changes: the stale pipe-buffer flags behavior and a later change enabling merging. Ubuntu says the latter is present starting with kernel 5.8 and recommends a kernel upgrade and reboot. Its package instructions and release-specific fixes apply to Ubuntu, not ChromeOS. Ubuntu’s CVE-2022-0847 advisory is useful for understanding that distribution’s remediation, but it should not be used to choose a ChromeOS fix version.
What is known about ChromeOS updates
The ChromeOS security-advisory index says many fixes are handled as security bugs and rolled out through ChromeOS auto-update rather than listed on a dedicated public advisory page. It explains: “We do not routinely publish information for all fixed vulnerabilities on a dedicated page, just for vulnerabilities where users/customers will benefit from a more in-depth description of the issue and/or where mitigative action by the user is necessary.” The ChromeOS security advisories index therefore cannot be treated as a complete list of every fix. Not finding a Dirty Pipe entry there is not proof that ChromeOS was unaffected or unpatched.
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ChromeOS documentation describes isolation mechanisms including sandboxing, virtual machines, and containers. That general architecture does not establish whether a particular ChromeOS build was affected by this specific kernel flaw. The Chromium OS project documentation provides general ChromeOS context, not a Dirty Pipe affected-model list or fixed-build notice.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What Chromebook owners should do
Update the ChromeOS host
Use ChromeOS’s built-in updater and install updates offered for your device. The sources available for this issue do not provide a Dirty Pipe-specific ChromeOS build number, affected-model list, or fix date, so there is no supported version threshold to check against.
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Update a separate Linux environment separately
If you use a Linux development environment or another Linux distribution on your Chromebook, its kernel and packages have their own update path. Apply that environment’s supported updates; do not infer its status from the ChromeOS host version. Likewise, do not attempt to install an upstream Linux kernel on a standard Chromebook based on the upstream affected-version list.
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What the evidence does not establish
- It does not establish that all Chromebooks were affected.
- It does not establish whether a particular Chromebook model or ChromeOS build was affected.
- It does not identify the precise ChromeOS release in which a Dirty Pipe fix shipped.
- It does not make the upstream Linux version boundaries a reliable stand-alone test for a ChromeOS device.
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