Medium [CVE-2026-10805] Networkmanager: networkmanager: local privilege escalation via malformed mud urls in dhclient backend
This medium-severity Red Hat Linux advisory covers CVE-2026-10805 affecting Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support.
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Summary
A flaw was found in NetworkManager. This local privilege escalation vulnerability exists in NetworkManager's dhclient backend when processing malformed Manufacturer Usage Description (MUD) URLs.
A local user can exploit this flaw to escalate privileges by triggering a script via a crafted MUD URL, provided an administrator has explicitly configured NetworkManager to use dhclient. This issue does not affect default configurations of NetworkManager.
Red Hat severity: Moderate — CVSS 6.7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-78.
Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Multicluster Engine for Kubernetes; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat OpenShift Container Platform 4.
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 20 days ago·verify at source
- NetworkManager-1:1.40.16-21.el8_10
- NetworkManager-1:1.30.0-19.el8_4.1
- NetworkManager-1:1.36.0-18.el8_6.1
- NetworkManager-1:1.40.16-10.el8_8.1
- NetworkManager-1:1.54.3-5.el9_8
- NetworkManager-1:1.42.2-32.el9_2.1
- NetworkManager-1:1.46.0-38.el9_4.1
- NetworkManager-1:1.52.0-11.el9_6.1
- RHSA-2026:58555
- RHSA-2026:61239
- RHSA-2026:61580
- RHSA-2026:61572
- RHSA-2026:58572
- RHSA-2026:61244
- RHSA-2026:61243
- RHSA-2026:61341
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
Mitigation checklist
- To prevent exploitation, ensure NetworkManager is not configured to use the `dhclient` backend. The default configuration on Red Hat Enterprise Linux does not enable `dhclient`. If a custom configuration file, such as `/etc/NetworkManager/conf.d/00-dhcp.conf`, contains `[main] dhcp=dhclient`, remove or comment out this line. After modifying the configuration, restart the NetworkManager service: `sudo systemctl restart NetworkManager` Warning: Restarting the NetworkManager service will temporarily disrupt network connectivity.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
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