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Copy Fail – CVE-2026-31431

copy.fail

April 29, 2026

3 min read

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79/100

Summary

Copy Fail is a logic flaw that allows for local privilege escalation on Linux systems without the need for a race window or kernel-specific offsets. A 732-byte Python script can exploit this flaw to gain root access on every Linux distribution released since 2017, functioning unmodified across multiple systems.

Key Takeaways

Copy Fail is a Linux local privilege escalation vulnerability that exploits a logic flaw, allowing unprivileged users to gain root access on any Linux distribution shipped since 2017 using a 732-byte Python script.
The exploit is silently exploitable for nearly a decade and requires no network access or special kernel debugging features, making it a significant risk for shared environments.
A patch is available that reverts a specific in-place optimization in the kernel, and users are advised to disable the algif_aead module before applying the patch.
The vulnerability affects multiple Linux distributions, including Ubuntu, Amazon Linux, RHEL, and SUSE, and can compromise shared systems such as CI/CD environments and multi-user servers.

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Community Sentiment

Mixed

Positives

The vulnerability appears to be real and poses a high risk, prompting necessary security updates across affected systems.
The discovery of this vulnerability contributes meaningfully to the open-source software ecosystem, highlighting the importance of security in AI applications.

Concerns

Claims of the exploit escaping containers lack supporting evidence, raising doubts about its effectiveness in real-world scenarios.
The assertion that the script roots every Linux distribution since 2017 is misleading, as it has only been tested on a few and fails on others like Alpine.
The vulnerability is being treated as a medium risk by many distros, despite its potential for local root privilege escalation, which should be prioritized higher.