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Red Hat Enterprise Linux 10 EUVDEUVD-2026-16557

| CVE-2026-4948 MEDIUM
Incorrect Execution-Assigned Permissions (CWE-279)
2026-03-27 redhat
Authentication Bypass Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Openshift Container Platform 4 Red Hat
5.5
CVSS 3.1 · Vendor: redhat
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Vulnerability Assessment

Weakness
CWE
CWE-279
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V8 - Authorization Incorrect execution permissions
Impact

The CVSS 3.1 base score of 5.5 (vector: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N) indicates a medium-severity integrity-focused vulnerability with low attack complexity, requiring only local access and low-level user privileges. The high integrity impact (I:H) reflects the ability to modify firewall rules, while confidentiality and availability remain unaffected. Real-world risk is substantial in multi-tenant or shared-system environments where local unprivileged users exist (e.g., container nodes, shared Linux servers). However, the requirement for local access (AV:L) and already-present user privileges (PR:L) limits the attack surface compared to remote vulnerabilities. Exploitation is highly automatable given the direct D-Bus method calls involved. The lack of any KEV confirmation or publicly disclosed POC at this time suggests the vulnerability is not yet actively exploited in the wild, though the straightforward nature of D-Bus method calls means a functional exploit could be developed quickly. Organizations running multi-user or containerized environments should prioritize patching, while single-user or air-gapped deployments face lower practical risk.
Exploit ScenarioDerived

An unprivileged local user on a Red Hat Enterprise Linux 8 system (e.g., a service account or containerized workload) invokes the setZoneSettings2 or setPolicySettings D-Bus method to open inbound ports or disable firewall rules protecting sensitive internal services. Because the D-Bus authorization policy lacks proper access control checks, the call succeeds despite the caller lacking firewall administration rights. The attacker then establishes a network connection to a previously blocked internal service (e.g., database, management interface) or exfiltrates data via an outbound port that the firewall would normally block. This is particularly dangerous in container environments where firewall rules isolate workloads; a compromised container could weaponize this flaw to pivot to adjacent services.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 27, 2026

Firewalld on Red Hat Enterprise Linux 7, 8, 9, and 10, as well as OpenShift Container Platform 4, contains an authentication bypass vulnerability in two D-Bus setters (setZoneSettings2 and setPolicySettings) that allows local unprivileged users to modify runtime firewall configurations without proper authorization. An authenticated local attacker can exploit this to change network security policies, potentially enabling lateral movement or service disruption. No public exploit code has been identified at the time of analysis, though Red Hat has issued security advisories (CVE-2026-4948, Bugzilla #2452086).

RemediationAI

Apply the security update provided by Red Hat for firewalld across all affected Red Hat Enterprise Linux systems (7, 8, 9, 10) and OpenShift Container Platform 4.x deployments. Consult the vendor advisory at https://access.redhat.com/security/cve/CVE-2026-4948 for exact patched package versions and deployment guidance. For systems where immediate patching is not feasible, implement host-level access controls to restrict which local users can execute on the system, and review D-Bus policy files (/etc/dbus-1/system.d/firewalld.conf or equivalent) to verify authorization rules if local modifications are possible. Container platforms should prioritize patching node images and redeploying affected nodes. Monitor D-Bus method invocations for setZoneSettings2 and setPolicySettings calls originating from unprivileged user contexts as a temporary detection measure.

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Technical ContextAI · show details

The vulnerability exists in firewalld's D-Bus interface, a system message bus used for inter-process communication on Linux systems. Specifically, the setZoneSettings2 and setPolicySettings D-Bus methods implement insufficient authorization checks (CWE-279: Improper Access Control), allowing local users with basic privileges to invoke these setters despite lacking the required permissions to modify firewall runtime state. Affected versions span Red Hat Enterprise Linux across major releases (7, 8, 9, 10) and container platforms (OpenShift 4.x), as confirmed by CPE identifiers cpe:2.3:a:red_hat:red_hat_enterprise_linux_*. The flaw is rooted in the D-Bus service definition or firewalld daemon's policy enforcement layer failing to validate caller credentials before applying zone and policy configuration changes.

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Severity by source

Vendor (redhat) PRIMARY 5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
SUSE MEDIUM
Red Hat 5.5 MEDIUM

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

2
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
CVE Published
Mar 27, 2026 - 05:30 nvd
MEDIUM 5.5

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

Organizations using A flaw should be aware of moderate risk from CVE-2026-4948 rated CVSS 5.5. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score
0.0%
Top 95% exploitable
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment MSRC Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Defer
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact
Low
Technical Impact
Partial

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:red_hat:red_hat_enterprise_linux_10:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_7:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_8:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_9:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_openshift_container_platform_4:*:*:*:*:*:*:*:*

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Same weakness CWE-279 – Incorrect Execution-Assigned Permissions

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CVE-2025-14025 HIGH
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CVE-2024-11220 HIGH
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CVE-2025-30001 HIGH
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Same technique Authentication Bypass

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CVE-2023-22515 CRITICAL POC
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CVE-2012-4681 CRITICAL POC
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CVE-2013-2465 CRITICAL POC
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CVE-2011-3544 CRITICAL POC
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CVE-2022-40684 CRITICAL POC
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CVE-2025-61882 CRITICAL POC
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CVE-2024-0012 CRITICAL POC
9.3

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed
SUSE Linux Enterprise Micro 5.4 Fixed

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-4948 ADVISORY https://vuldb.com/vuln/353819 REF https://access.redhat.com/errata/RHBA-2026:28238 REF https://access.redhat.com/errata/RHSA-2026:67585 REF https://access.redhat.com/errata/RHSA-2026:67843 REF https://access.redhat.com/errata/RHSA-2026:76844 REF https://access.redhat.com/security/cve/CVE-2026-4948 REF https://bugzilla.redhat.com/show_bug.cgi?id=2452086 REF https://lists.debian.org/debian-lts-announce/2026/05/msg00029.html

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