High [CVE-2026-14476] GPO cache path traversal via unsanitized gPCFileSysPath allows Kerberos authentication bypass
This high-severity Red Hat Linux advisory covers CVE-2026-14476 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support.
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Summary
A path traversal flaw was found in SSSD's AD GPO provider. The ad_gpo_extract_smb_components() function does not sanitize.. sequences in the gPCFileSysPath LDAP attribute, allowing an attacker with AD GPO management access to write files outside the GPO cache directory as root.
On default RHEL configurations with SELinux enforcing, this can be used to inject Kerberos configuration leading to authentication bypass. SELinux blocks writes to most security-critical paths such as /etc/cron.d/.
Red Hat severity: Moderate — CVSS 8 (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H). Weakness: CWE-23.
Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 15 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
- sssd-0:2.12.0-3.el10_2.1
- sssd-0:2.10.2-3.el10_0.5
- sssd-0:1.16.5-10.el7_9.18
- sssd-0:2.9.4-5.el8_10.5
- sssd-0:2.4.0-9.el8_4.5
- sssd-0:2.6.2-4.el8_6.5
- sssd-0:2.8.2-4.el8_8.4
- sssd-0:2.9.8-4.el9_8.1
- sssd-0:2.8.2-5.el9_2.7
- sssd-0:2.9.4-6.el9_4.5
- sssd-0:2.9.6-4.el9_6.5
- rhcos-413.92.202608111330-0
- rhcos-418.94.202608142238-0
- rhcos-4.19.9.6.202608120446-0
- rhcos-4.20.9.6.202608121719-0
- rhcos-4.21.9.6.202608122143-0
- rhcos-4.22.9.8.202608130832-0
- RHSA-2026:41937
- RHSA-2026:46482
- RHSA-2026:50109
- RHSA-2026:46990
- RHSA-2026:49841
- RHSA-2026:49844
- RHSA-2026:49842
- RHSA-2026:42122
- RHSA-2026:49843
- RHSA-2026:49840
- RHSA-2026:49839
- RHSA-2026:54187
- RHSA-2026:57483
- RHSA-2026:54553
- RHSA-2026:54581
- RHSA-2026:54599
- RHSA-2026:54769
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Mitigation checklist
- Set ad_gpo_access_control = disabled in /etc/sssd/sssd.conf to disable GPO fetching entirely. Note that this removes GPO-based login policy enforcement.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
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