Danny Weber
Critical Linux vulnerability CopyFail allows privilege escalation and system takeover. US authorities warn of active exploitation. Patch now to protect.
A critical vulnerability has been discovered in the Linux operating system. It could let attackers take complete control of a device. US authorities have issued a warning, describing the risk as high.
Dubbed CopyFail (CVE-2026-31431), the flaw resides in the Linux kernel. Reports indicate it exists in nearly every version of Linux released since 2017.
The issue stems from a memory data handling flaw. In certain situations, the system incorrectly copies data, causing memory corruption. This allows privilege escalation: a low-privileged user can gain root access and take over the system.
This vulnerability is particularly dangerous for servers. A successful exploit could allow attackers to take over infrastructure, access sensitive data, and use the compromised system to launch further attacks.
While the vulnerability isn't directly exploitable over the internet, it can be combined with other network flaws to enable remote attacks.
US authorities report that CopyFail is already being exploited in active attacks, raising the threat level considerably. CISA has ordered federal agencies to patch the flaw by a strict deadline of May 15.
Security patches are already available from the developers. Users and organizations are urged to install them promptly to mitigate the risk of system compromise.
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