A new Linux kernel vulnerability, "Copy Fail" (CVE-2026-31431), allows local users to gain root access by writing four bytes into the page cache of readable files.

• Impact: Local Privilege Escalation (LPE) to root.
• Scope: Affects Linux kernels 4.14 and later (since 2017).
• Distributions: Impacted systems include Ubuntu, RHEL, Amazon Linux, and SUSE.

Recommended Action

Immediate patching is required. If patching is not possible, apply module-level mitigations as specified by your distribution's security advisory.

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