Vulnerability-Lookup

RHSA-2026:71609

Vulnerability from csaf_redhat - Published: 2026-09-24 12:46 - Updated: 2026-09-24 17:52

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Important

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: sudo: * sudo-1.9.17-16.p2.2.hum1 (aarch64, x86_64) * sudo-devel-1.9.17-16.p2.2.hum1 (aarch64, x86_64) * sudo-logsrvd-1.9.17-16.p2.2.hum1 (aarch64, x86_64) * sudo-python-plugin-1.9.17-16.p2.2.hum1 (aarch64, x86_64) * sudo-1.9.17-16.p2.2.hum1.src (src) Security Fix(es): sudo: * CVE-2026-96512

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-96512

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.

7.8 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-863 - Incorrect Authorization

Affected products

Fixed 9 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:sudo-devel-0:1.9.17-16.p2.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:sudo-devel-0:1.9.17-16.p2.2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:sudo-logsrvd-0:1.9.17-16.p2.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:sudo-logsrvd-0:1.9.17-16.p2.2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:sudo-python-plugin-0:1.9.17-16.p2.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:sudo-python-plugin-0:1.9.17-16.p2.2.hum1@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

10 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:71609	self
https://access.redhat.com/security/cve/CVE-2026-96512	external
https://access.redhat.com/security/updates/classi…	external
https://images.redhat.com/	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-96512	self
https://bugzilla.redhat.com/show_bug.cgi?id=2539327	external
https://www.cve.org/CVERecord?id=CVE-2026-96512	external
https://nvd.nist.gov/vuln/detail/CVE-2026-96512	external
https://github.com/sudo-project/sudo/commit/1820a…	external

Acknowledgments

Independent security research Ermenson Junior

JSON

To clipboard

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          ],
          "organization": "Independent security research",
          "summary": "Acknowledged by upstream."
        }
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      "cve": "CVE-2026-96512",
      "cwe": {
        "id": "CWE-863",
        "name": "Incorrect Authorization"
      },
      "discovery_date": "2026-08-28T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2539327"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "sudo: sudo: TZ environment variable allows bypass of NOTBEFORE/NOTAFTER time-based authorization",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as Important severity because a local authenticated user can bypass time-based sudoers restrictions and execute privileged commands outside the configured validity window. Exploitation requires a sudoers rule with NOTBEFORE or NOTAFTER timestamps that omit the trailing \u0027Z\u0027 suffix, and the attacker must be the subject of such a rule. This is an optional feature not enabled in default configurations. PAM authentication is unaffected; the attacker cannot gain access beyond what the sudoers rule already grants. Sudo calls unsetenv(\"TZ\") and tzset() early in startup as a partial defense, but upstream accepted and fixed the vulnerability, indicating this control is insufficient on at least some platforms. Red Hat ships sudo in all supported RHEL versions (RHEL 7 through RHEL 10 and RHIVOS). Red Hat product impact analysis for specific streams is pending affect filing.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "Red Hat Hardened Images:sudo-python-plugin-0:1.9.17-16.p2.2.hum1@aarch64",
          "Red Hat Hardened Images:sudo-python-plugin-0:1.9.17-16.p2.2.hum1@x86_64"
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-96512"
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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-96512"
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-96512",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96512"
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          "summary": "https://github.com/sudo-project/sudo/commit/1820a349687522f51023d1ae5925125f59679a8c",
          "url": "https://github.com/sudo-project/sudo/commit/1820a349687522f51023d1ae5925125f59679a8c"
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      "release_date": "2026-09-23T12:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-09-24T12:46:42+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@src",
            "Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@x86_64",
            "Red Hat Hardened Images:sudo-devel-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-devel-0:1.9.17-16.p2.2.hum1@x86_64",
            "Red Hat Hardened Images:sudo-logsrvd-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-logsrvd-0:1.9.17-16.p2.2.hum1@x86_64",
            "Red Hat Hardened Images:sudo-python-plugin-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-python-plugin-0:1.9.17-16.p2.2.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:71609"
        },
        {
          "category": "workaround",
          "details": "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.",
          "product_ids": [
            "Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@src",
            "Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@x86_64",
            "Red Hat Hardened Images:sudo-devel-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-devel-0:1.9.17-16.p2.2.hum1@x86_64",
            "Red Hat Hardened Images:sudo-logsrvd-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-logsrvd-0:1.9.17-16.p2.2.hum1@x86_64",
            "Red Hat Hardened Images:sudo-python-plugin-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-python-plugin-0:1.9.17-16.p2.2.hum1@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@src",
            "Red Hat Hardened Images:sudo-0:1.9.17-16.p2.2.hum1@x86_64",
            "Red Hat Hardened Images:sudo-devel-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-devel-0:1.9.17-16.p2.2.hum1@x86_64",
            "Red Hat Hardened Images:sudo-logsrvd-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-logsrvd-0:1.9.17-16.p2.2.hum1@x86_64",
            "Red Hat Hardened Images:sudo-python-plugin-0:1.9.17-16.p2.2.hum1@aarch64",
            "Red Hat Hardened Images:sudo-python-plugin-0:1.9.17-16.p2.2.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "sudo: sudo: TZ environment variable allows bypass of NOTBEFORE/NOTAFTER time-based authorization"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-09-23 13:22 – Updated: 2026-09-24 18:09

Title

Sudo: sudo: tz environment variable allows bypass of notbefore/notafter time-based authorization

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 redhat root

References

5 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:71609	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-96512	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2539327	issue-trackingx_refsource_REDHAT
https://github.com/sudo-project/sudo/commit/1820a…
http://www.openwall.com/lists/oss-security/2026/09/24/4

Impacted products

5 products

Vendor	Product	Version
Red Hat	Red Hat Hardened Images	Unaffected: 1.9.17-16.p2.2.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Date Public

2026-09-23 12:00

Credits

Upstream acknowledges Ermenson Junior (Independent security research) as the original reporter.

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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RHSA-2026:71609

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

Tags

Sightings

Nomenclature

Related by attack behaviour