Researchers Disclosed High-Severity Sudo Vulnerability
A newly identified flaw allows unprivileged Linux users to bypass critical time-based authorization controls.
Updated on Sept. 25, 2026 in Cybersecurity
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Security researchers have disclosed a high-severity vulnerability in Sudo, the tool used for providing administrative access on Linux systems. The flaw enables local unprivileged users to manipulate time-based authorization constraints and bypass security policies.
Why it matters
The vulnerability allows attackers to alter time-sensitive permissions, undermining the security posture of systems that rely on scheduled authorization constraints. This exposure highlights potential risks to access management within sensitive enterprise environments.
The vulnerability, tracked as CVE-2026-96512 and Red Hat Bug 2539327, stems from Sudo's processing of the attacker-controlled TZ environment variable. This manipulation specifically targets NOTBEFORE and NOTAFTER authorization constraints.
The players
Sudo
Sudo is a widely used software tool for Unix-like computer operating systems that allows users to run programs with the security privileges of another user.
Red Hat
Red Hat is a leading provider of open-source software solutions to the enterprise, including the widely deployed Red Hat Enterprise Linux operating system.
The details
The vulnerability allows an attacker to influence Sudo's internal time tracking, effectively bypassing rules that restrict command execution to specific windows. By exploiting the way Sudo handles the TZ environment variable, an unprivileged user can force the system to evaluate authorization policies outside of their intended temporal scope.
Timeline
September 25, 2026: The vulnerability was publicly disclosed.
The Tech Race
This vulnerability underscores the persistent challenge of securing legacy command-line utilities that have become foundational to modern infrastructure. As the industry moves toward more robust identity and access management, flaws in core tools like Sudo necessitate continuous updates and oversight.
Users and system administrators should monitor their software repositories for official security patches to address this vulnerability. Failing to update may leave Linux systems susceptible to unauthorized command execution by local users.
The takeaway
Maintaining updated software versions remains the most effective defense against localized privilege escalation attempts. Administrators should audit existing sudoers policies to identify any dependencies on time-based constraints that might be targeted by similar future exploits.
Further reading
Learn more about securing sensitive system environments in our Cybersecurity section.
Source note: This article includes information reported by IT Security News - cybersecurity, infosecurity news.
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