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Found by Xint Code, the Copy Fail (CVE-2026-31431) security vulnerability, which could allow a local user to elevate privileges to the root user, has been patched in Debian, Ubuntu, AlmaLinux OS, and other popular distributions affected by this flaw.
On April 29th, 2026, a local privilege escalation vulnerability affecting the Linux kernel was publicly disclosed as CVE-2026-31431 and referred to as “Copy Fail.” The vulnerability affects the algif_aead kernel module, which provides hardware-accelerated cryptographic functions.
Who is affected? This vulnerability primarily affects multi-tenant Linux hosts, container clusters, and standard Linux servers. If you are the only user on your system, you are mostly safe because the vulnerability doesn’t grant remote attackers access by itself, but it can be exploited via local code execution.
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