#1
Schneier on Security
threat-intel
May 12, 2026 at 11:06 UTC
Copy.Fail Linux Vulnerability
By Bruce Schneier
AI Summary
The Copy.Fail vulnerability is a Linux kernel local privilege escalation (disclosed by Theori on April 29, 2026) that abuses AF_ALG sockets and splice() to write four bytes at a time into the page cache of files the attacker doesn't own. Critically, the exploit works unmodified across Ubuntu, RHEL, Debian, SUSE, Amazon Linux, Fedora, and most other major distributions with no race condition required — making it exceptionally reliable and broadly dangerous for enterprise Linux environments.
Relevance score: 92.0/100
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