Medium [CVE-2026-4948] local unprivileged user can modify firewall state due to d-bus setter mis-authorization
This medium-severity Red Hat Linux advisory covers CVE-2026-4948 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat Enterprise Linux 7.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
A flaw was found in firewalld. A local unprivileged user can exploit this vulnerability by mis-authorizing two runtime D-Bus (Desktop Bus) setters, setZoneSettings2 and setPolicySettings.
This mis-authorization allows the user to modify the runtime firewall state without proper authentication, leading to unauthorized changes in network security configurations.
This vulnerability is rated as Moderate impact because exploitation is restricted to local unprivileged users and requires an active desktop PolicyKit configuration to alter runtime firewall rules. Standard server environments remain largely unaffected unless configured with desktop authorization profiles that relax permissions for active local sessions.
While an attacker can tamper with active packet filtering policies without administrative credentials, the flaw does not facilitate direct privilege escalation or permanent configuration changes. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N).
Weakness: CWE-279. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4.
Affected products named by the advisory: Red Hat package: firewalld.
Is CVE-2026-4948 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-4948 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-4948?
Upgrade to a fixed release named by Red Hat:
- firewalld-0:2.4.2-1.el10_2
- firewalld-0:2.3.1-1.el10_0.1
- firewalld-0:1.3.4-20.el9_8
- firewalld-0:1.3.4-15.el9_6.1
- RHBA-2026:28238
- RHSA-2026:67843
- RHSA-2026:67585
- RHSA-2026:76844
Confirm against the vendor advisory before you patch.
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 6 days ago·verify at source
- firewalld-0:2.4.2-1.el10_2
- firewalld-0:2.3.1-1.el10_0.1
- firewalld-0:1.3.4-20.el9_8
- firewalld-0:1.3.4-15.el9_6.1
- RHBA-2026:28238
- RHSA-2026:67843
- RHSA-2026:67585
- RHSA-2026:76844
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation checklist
- To mitigate this issue, ensure that the firewalld desktop policy is not active on systems where local unprivileged user access is a concern. If firewalld is not required, it can be disabled. Disabling firewalld may impact network services that rely on it. To disable firewalld: sudo systemctl stop firewalld sudo systemctl disable firewalld A system restart or service reload may be required for changes to take full effect.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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