CVE-2026-4948: A flaw was found in firewalld

Q: How do I fix CVE-2026-4948?

firewalld: upgrade to newer than 2.4.0; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-4948 being exploited?

CVE-2026-4948 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-4948 affect?

CVE-2026-4948 affects firewalld, enterprise linux. Severity is medium (CVSS 5.5). 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

Q: How urgent is CVE-2026-4948?

Priority 25/100. On your watchlist

Routine

MEDIUM 5.5WATCHLISTUPGRADEMITIGATE

CVE-2026-4948 is a medium-severity flaw (CVSS 5.5) affecting firewalld, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-279
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): Red Hat, Inc. · Vendor: firewalld · redhat

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 06:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

firewalld firewalld UPGRADE

Affected: <= 2.4.0

Fixed in: newer than 2.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firewalld || rpm -q firewalld || firewalld --version

2. UPGRADE to newer than 2.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firewalld

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firewalld

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

redhat enterprise linux MITIGATE

Affected: 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4948?

firewalld: upgrade to newer than 2.4.0; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4948 being exploited?

CVE-2026-4948 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4948 affect?

CVE-2026-4948 affects firewalld, enterprise linux. Severity is medium (CVSS 5.5). 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

How urgent is CVE-2026-4948?

Priority 25/100. On your watchlist

References

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