CVE-2026-96512
Full vulnerability record from the local CVENow database.
Description
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.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-09-23 14:17:10.747000
Last modified
2026-10-29 20:17:36.830000
View original CVE JSON
{
"id": "CVE-2026-96512",
"sourceIdentifier": "[email protected]",
"published": "2026-09-23T14:17:10.747",
"lastModified": "2026-10-29T20:17:36.830",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
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}
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],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
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],
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"ssvcData": {
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"id": "CVE-2026-96512",
"options": [
{
"exploitation": "none"
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{
"automatable": "no"
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{
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}
],
"role": "CISA Coordinator",
"version": "2.0.3"
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}
]
},
"weaknesses": [
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"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-863"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:71609",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:75571",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:75579",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:75580",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:82939",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:86633",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:86634",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:86635",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:87026",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:90287",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:91217",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:91219",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:91244",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:92325",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:92326",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:92349",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-96512",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2539327",
"source": "[email protected]"
},
{
"url": "https://github.com/sudo-project/sudo/commit/1820a349687522f51023d1ae5925125f59679a8c",
"source": "[email protected]"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/09/24/4",
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
]
}