Copy Fail (CVE-2026-31431) is a critical Linux kernel local privilege escalation (LPE) vulnerability that affects most major Linux distributions released since 2017
The flaw allows an unprivileged local user to gain root access through a reliable exploit that requires no race conditions or distribution-specific modifications. By abusing the Linux kernel’s Crypto API (AF_ALG) and splice() system call, the vulnerability can modify the page cache in memory without altering files on disk, making it difficult for traditional file integrity monitoring tools to detect. This makes Copy Fail a significant threat to shared environments such as Kubernetes clusters, CI/CD systems, cloud infrastructure, and multi-tenant servers.
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