CVE-2026-4948

MEDIUM

5.5

CVSS v3

Description

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.

CWE-279

How to fix

Remediation Available

firewalldDebian

Fixed in:0.9.3-2+deb11u1CVE-2026-4948

Fixed in:1.3.3-1~deb12u2CVE-2026-4948

Fixed in:2.3.1-1+deb13u1CVE-2026-4948

Fixed in:2.4.0-2CVE-2026-4948

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.12%probability of exploitation in 30 days

2ndpercentile

Low risk: more likely to be exploited than 2% of all known CVEs.

References

Vendor Advisory2

Other references2

Related Vulnerabilities

Other CWE-279 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4665	High	8.8	1.1%	-	Fix
CVE-2024-37734	Critical	9.8	0.8%	-	-
CVE-2017-8441	Medium	4.3	0.7%	-	Fix
CVE-2023-50914	Medium	6.7	0.7%	-	-
CVE-2022-21699	High	8.2	0.7%	-	Fix
CVE-2023-3915	Medium	6.5	0.6%	-	Fix

Common questions

How do I fix CVE-2026-4948?

Upgrade firewalld on debian 11 to 0.9.3-2+deb11u1 or later.

Is CVE-2026-4948 being actively exploited?

Not that we know of. CVE-2026-4948 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.12% is the estimated probability that it will be exploited in the next 30 days. That is higher than 2% of all scored CVEs.

How severe is CVE-2026-4948?

CVE-2026-4948 has a CVSS v3 base score of 5.5, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-4948 affect?

Published advisories record a fix for firewalld (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-30.