A flaw was found in sudo. When sudoers rules use NOTBEFORE or NOTAFTER time-based access restrictions with timestamps that omit the trailing 'Z' timezone indicator, the time evaluation relies on the TZ environment variable inherited from the calling user. Because sudo is a setuid-root program, an unprivileged local user can set TZ to an extreme timezone offset to shift the authorization window by up to approximately 25 hours, causing expired rules to be treated as valid. This allows the user to execute commands outside the intended time window. Authentication is not bypassed; only the time-based authorization check is affected.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade sudoUpgrade sudo-python-plugin | Oct 11, 2026 | Oct 5, 2026 |
| Amazon_linux_2023 | — | Upgrade sudo-logsrvd-debuginfoUpgrade sudo-debuginfoUpgrade sudo-debugsourceUpgrade sudo-python-plugin-debuginfoUpgrade sudoUpgrade sudo-logsrvdUpgrade sudo-python-pluginUpgrade sudo-devel | Oct 13, 2026 | Sep 23, 2026 |
| Redhat_linux | — | Upgrade sudo-python-plugin-debuginfoUpgrade sudo-debugsourceUpgrade sudo-debuginfoNo solution existsUpgrade sudoUpgrade sudo-python-plugin | Sep 25, 2026 | Sep 23, 2026 |
| Rocky_linux | — | Upgrade sudo-python-pluginUpgrade sudo-python-plugin-debuginfoUpgrade sudo-debugsourceUpgrade sudoUpgrade sudo-debuginfo | Oct 7, 2026 | Oct 6, 2026 |
| Ubuntu | — | Upgrade sudo-ldapUpgrade sudo | Oct 7, 2026 | Sep 23, 2026 |
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