Researchers Disclosed High-Severity Sudo Vulnerability
A new flaw in the Sudo utility allows unprivileged Linux users to circumvent time-based authorization constraints.
Updated on Sept. 25, 2026 in Cybersecurity
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Security researchers have disclosed a high-severity vulnerability, tracked as CVE-2026-96512, that impacts the Sudo utility on Linux systems. This vulnerability allows unprivileged users to bypass established time-based access controls.
Why it matters
The flaw exposes potential weaknesses in sudoers policies, which define user permissions, by allowing manipulation of sensitive time constraints. It highlights the security risks inherent in the handling of environment variables within privileged system processes.
The vulnerability, identified as CVE-2026-96512 and tracked by Red Hat as Bug 2539327, stems from how Sudo processes the TZ environment variable. This allows an attacker to manipulate the NOTBEFORE and NOTAFTER constraints within a sudoers policy.
The players
Sudo
A foundational utility for Unix-like operating systems that enables authorized users to run commands with elevated privileges.
Red Hat
A major enterprise Linux software provider that tracks, patches, and manages vulnerabilities across its distribution ecosystem.
The details
The flaw occurs because Sudo improperly validates the TZ environment variable, a setting used to define the local time zone for a process. By controlling this variable, an unprivileged user can trick the system into misinterpreting the time-based restrictions set by administrators in the sudoers policy, which governs command-line access rights. This effectively allows an attacker to bypass time-of-day access requirements intended to limit unauthorized command execution.
Timeline
September 25, 2026: Vulnerability disclosed.
The Tech Race
This finding follows a historical pattern of privilege escalation vulnerabilities identified in the Sudo utility, similar to the 2021 Baron Samedit exploit. Security researchers continue to focus on audit-heavy components like sudoers policies to identify bypasses in core system administration tools.
System administrators should prepare to update their Linux distributions as patches become available to address CVE-2026-96512. Users in environments relying on time-based sudoers policies are particularly encouraged to audit system logs until updates are applied.
The takeaway
The security of administrative tools remains a critical vector for local privilege escalation on Linux systems. Administrators should monitor Red Hat Bug 2539327 updates for patch release schedules and deployment guidance.
Further reading
For more information on modern system vulnerabilities, visit our Cybersecurity section.
Source note: This article includes information reported by IT Security News - cybersecurity, infosecurity news.
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