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📂 **Category**:
💡 **What You’ll Learn**:
Who is affected
If your kernel was built between 2017 and the patch — which covers essentially every mainstream Linux distribution — you’re in scope.
Copy Fail requires only an unprivileged local user account — no network access, no kernel debugging features, no pre-installed primitives. The kernel crypto API (AF_ALG) ships enabled in essentially every mainstream distro’s default config, so the entire 2017 → patch window is in play out of the box.
Distributions we directly verified:
| Distribution | Kernel |
|---|---|
| Ubuntu 24.04 LTS | 6.17.0-1007-aws |
| Amazon Linux 2023 | 6.18.8-9.213.amzn2023 |
| RHEL 14.3 | 6.12.0-124.45.1.el10_1 |
| SUSE 16 | 6.12.0-160000.9-default |
These are what we tested directly. Other distributions running affected kernels — Debian, Arch, Fedora, Rocky, Alma, Oracle, the embedded crowd — behave the same. Tested it elsewhere? Open an issue to add to the list.
Should you patch first?
High
Multi-tenant Linux hosts
Shared dev boxes, shell-as-a-service, jump hosts, build servers — anywhere multiple users share a kernel.
any user becomes root
High
Kubernetes / container clusters
The page cache is shared across the host. A pod with the right primitives compromises the node and crosses tenant boundaries.
cross-container, cross-tenant
High
CI runners & build farms
GitHub Actions self-hosted runners, GitLab runners, Jenkins agents — anything that executes untrusted PR code as a regular user, on a shared kernel.
a PR becomes root on the runner
High
Cloud SaaS running user code
Notebook hosts, agent sandboxes, serverless functions, any tenant-supplied container or script.
tenant becomes host root
Medium
Standard Linux servers
Single-tenant production where only your team has shell access.
internal LPE; chains with web RCE or stolen creds
Lower
Single-user laptops & workstations
You’re already the only user. The bug doesn’t grant remote attackers access by itself, but any local code execution becomes root.
post-exploitation step-up
💬 **What’s your take?**
Share your thoughts in the comments below!
#️⃣ **#Copy #Fail #CVE202631431**
🕒 **Posted on**: 1777488745
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