CVE-2026-96512 (GCVE-0-2026-96512)
Vulnerability from cvelistv5
Published
2026-09-23 13:22
Modified
2026-10-26 13:55
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-863 - Incorrect 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.
References
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:1.9.17-10.p2.el10_2.7   < *
    cpe:/o:redhat:enterprise_linux:10.2
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:1.9.15-8.p5.el10_0.5   < *
    cpe:/o:redhat:enterprise_linux_eus:10.0
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:1.9.5p2-2.el8_10   < *
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:1.9.5p2-1.el8_8.4   < *
    cpe:/o:redhat:rhel_e4s:8.8::baseos
    cpe:/o:redhat:rhel_tus:8.8::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:1.9.5p2-1.el8_8.4   < *
    cpe:/o:redhat:rhel_e4s:8.8::baseos
    cpe:/o:redhat:rhel_tus:8.8::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:1.9.17p2-3.el9_8.3   < *
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:1.9.17p2-3.el9_8.3   < *
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:1.9.5p2-9.el9_2.5   < *
    cpe:/a:redhat:rhel_e4s:9.2::appstream
    cpe:/o:redhat:rhel_e4s:9.2::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:1.9.5p2-10.el9_4.4   < *
    cpe:/a:redhat:rhel_e4s:9.4::appstream
    cpe:/o:redhat:rhel_e4s:9.4::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:1.9.5p2-10.el9_6.4   < *
    cpe:/a:redhat:rhel_eus:9.6::appstream
    cpe:/o:redhat:rhel_eus:9.6::baseos
 Create a notification for this product.
   Red Hat Red Hat Hardened Images Unaffected: 1.9.17-16.p2.2.hum1   < *
    cpe:/a:redhat:hummingbird:1
 Create a notification for this product.
   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1791964013   < *
    cpe:/a:redhat:rhui:5::el9
 Create a notification for this product.
   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1791978693   < *
    cpe:/a:redhat:rhui:5::el9
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
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\"rhui5/installer-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:rhui:5::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Update Infrastructure 5\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1791978693\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"rhui5/rhua-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:7\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 7\", \"packageName\": \"sudo\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-08-28T00:00:00.000Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2026-09-23T12:00:00.000Z\", \"value\": \"Made public.\"}], \"datePublic\": \"2026-09-23T12:00:00.000Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2026:71609\", \"name\": \"RHSA-2026:71609\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:75571\", \"name\": \"RHSA-2026:75571\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:75579\", \"name\": \"RHSA-2026:75579\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:75580\", \"name\": \"RHSA-2026:75580\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:82939\", \"name\": \"RHSA-2026:82939\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:86633\", \"name\": \"RHSA-2026:86633\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:86634\", \"name\": \"RHSA-2026:86634\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:86635\", \"name\": \"RHSA-2026:86635\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:87026\", \"name\": \"RHSA-2026:87026\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:90287\", \"name\": \"RHSA-2026:90287\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2026-96512\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2539327\", \"name\": \"RHBZ#2539327\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://github.com/sudo-project/sudo/commit/1820a349687522f51023d1ae5925125f59679a8c\"}], \"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.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"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 \u0027Z\u0027 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-863\", \"description\": \"Incorrect Authorization\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-10-26T13:55:30.140Z\"}, \"x_redhatCweChain\": \"CWE-863: Incorrect Authorization\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-96512\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-26T13:55:30.140Z\", \"dateReserved\": \"2026-09-23T10:31:55.548Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-09-23T13:22:33.080Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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