RHSA-2026:86634 | Vulnetix

RHSA-2026:86634 PUBLISHED CVSS 7.800000190734863 HIGH

Record from redhat · Published October 21, 2026

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.

Risk scores

CVSS 3.1

7.800000190734863

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

Affected products

Vendor	Product	Versions
Red Hat	sudo-debugsource-0:1.9.5p2-10.el9_6.4.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-debuginfo-0:1.9.5p2-10.el9_6.4.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-debuginfo-0:1.9.5p2-10.el9_6.4.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-debugsource-0:1.9.5p2-10.el9_6.4.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-python-plugin-debuginfo-0:1.9.5p2-10.el9_6.4.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-debuginfo-0:1.9.5p2-10.el9_6.4.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-python-plugin-debuginfo-0:1.9.5p2-10.el9_6.4.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-debugsource-0:1.9.5p2-10.el9_6.4.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-python-plugin-0:1.9.5p2-10.el9_6.4.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-python-plugin-0:1.9.5p2-10.el9_6.4.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-debuginfo-0:1.9.5p2-10.el9_6.4.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-python-plugin-debuginfo-0:1.9.5p2-10.el9_6.4.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-debuginfo-0:1.9.5p2-10.el9_6.4.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-debuginfo-0:1.9.5p2-10.el9_6.4.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-debugsource-0:1.9.5p2-10.el9_6.4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-python-plugin-debuginfo-0:1.9.5p2-10.el9_6.4.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-python-plugin-debuginfo-0:1.9.5p2-10.el9_6.4.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-0:1.9.5p2-10.el9_6.4.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-0:1.9.5p2-10.el9_6.4.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)	0:1.9.5p2-10.el9_6.4
Red Hat	sudo-debugsource-0:1.9.5p2-10.el9_6.4.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)	0:1.9.5p2-10.el9_6.4

…and 13 more

Timeline

Oct 21, 2026 CVE Published
Oct 22, 2026 CVE Updated
Oct 22, 2026 Distribution Patch (2 in total, the first dated here)
Oct 22, 2026 Security Advisory (2 in total, the first dated here)

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vulnetix vdb fixes RHSA-2026:86634

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References

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