CVE-2026-96512 (GCVE-0-2026-96512)

Vulnerability from cvelistv5 – Published: 2026-09-23 13:22 – Updated: 2026-10-14 19:03
VLAI
Title
Sudo: sudo: tz environment variable allows bypass of notbefore/notafter time-based authorization
Summary
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.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 00:00 UTC
CWE
  • CWE-863 - Incorrect Authorization
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1036 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:1.9.17-10.p2.el10_2.7 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:1.9.5p2-2.el8_10 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8::baseos
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:1.9.17p2-3.el9_8.3 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat Red Hat Hardened Images Unaffected: 1.9.17-16.p2.2.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1791964013 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1791978693 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Date Public
2026-09-23 12:00
Show details on NVD website

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      "product_status:recommended": "3",
      "source": "SUSE CSAF VEX",
      "status": "interim",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-96512.json",
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                    ],
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                    "timestamp": "2026-09-23T16:18:10.918476Z",
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
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            },
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              "product": "Red Hat Enterprise Linux 8",
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              ]
            },
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          ],
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              "lang": "en",
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              "name": "RHSA-2026:75579",
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                "x_refsource_REDHAT"
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            },
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              "url": "https://github.com/sudo-project/sudo/commit/1820a349687522f51023d1ae5925125f59679a8c"
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          ],
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              "time": "2026-08-28T00:00:00.000Z",
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              "lang": "en",
              "time": "2026-09-23T12:00:00.000Z",
              "value": "Made public."
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          ],
          "title": "Sudo: sudo: tz environment variable allows bypass of notbefore/notafter time-based authorization",
          "workarounds": [
            {
              "lang": "en",
              "value": "Append the \u0027Z\u0027 timezone suffix to all NOTBEFORE and NOTAFTER timestamps in sudoers rules. For example, change \u0027NOTAFTER=20261231235959\u0027 to \u0027NOTAFTER=20261231235959Z\u0027. Timestamps with the \u0027Z\u0027 suffix are interpreted as UTC via timegm() and are not affected by the TZ environment variable. Administrators can audit their sudoers configuration with: grep -rE \u0027NOT(BEFORE|AFTER)=\u0027 /etc/sudoers /etc/sudoers.d/ and verify that all timestamps end with \u0027Z\u0027."
            }
          ],
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        "assignerShortName": "redhat",
        "cveId": "CVE-2026-96512",
        "datePublished": "2026-09-23T13:22:33.080Z",
        "dateReserved": "2026-09-23T10:31:55.548Z",
        "dateUpdated": "2026-10-05T10:23:18.705Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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