security: CVE-2026-31431: Copy Fail vulnerability enables Linux root privilege escalation across cloud environments
Microsoft Security Blog
2026-05-02
Microsoft reports CVE-2026-31431 (“Copy Fail”), a high-severity Linux vulnerability that can be used for root privilege escalation in cloud and Kubernetes environments. The post says a working exploit is already in the wild and urges organizations to detect, mitigate, and reduce exposure quickly.