CVE-2026-96512Sudo: sudo: tz environment variable allows bypass of notbefore/notafter time-based authorization
Updated under an hour ago ()
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It affects Red Hat Enterprise Linux 10 and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:1.9.17-10.p2.el10_2.7 not affected | CNA record |
Red Hat Red Hat Hardened Images redhat:hummingbird | from 1.9.17-16.p2.2.hum1 not affected | CNA record |
Red Hat Red Hat Update Infrastructure 5 redhat:rhui | from 1791964013 not affected | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:71609vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:75571vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:75579vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:75580vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:82939vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-96512vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2539327issue-tracking, x-refsource-redhat
- https://github.com/sudo-project/sudo/commit/1820a349687522f51023d1ae5925125f59679a8c
- http://www.openwall.com/lists/oss-security/2026/09/24/4
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.