CVE-2026-25804: Antrea is a Kubernetes networking solution intended to be Kubernetes native

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CRITICAL 9.1REMOTEWATCHLISTUPGRADE

CVE-2026-25804 is a critical-severity flaw (CVSS 9.1) affecting antrea. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Antrea is a Kubernetes networking solution intended to be Kubernetes native. Prior to versions 2.3.2 and 2.4.3, Antrea's network policy priority assignment system has a uint16 arithmetic overflow bug that causes incorrect OpenFlow priority calculations when handling a large numbers of policies with various priority values. This results in potentially incorrect traffic enforcement. This issue has been patched in versions 2.4.3.

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-287, CWE-770
Published	2026-02-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: linuxfoundation

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-06 23:15 UTCPublished CVE record published
2026-06-17 10:25 UTCUpdated Record last modified

linuxfoundation antrea UPGRADE

Affected: < 2.3.2 · >= 2.4.0 and < 2.4.3

Fixed in: 2.3.2, 2.4.3

Safe to downgrade to: a release before 2.4.0

1. Check installed version

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

2. UPGRADE to 2.3.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade antrea

Note

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

3. If no update is available yet, DOWNGRADE to a release before 2.4.0 (Debian / Ubuntu)

apt-cache madison antrea sudo apt install antrea=<VERSION_BEFORE_2.4.0> sudo apt-mark hold antrea

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list antrea sudo dnf downgrade antrea-<VERSION_BEFORE_2.4.0> sudo dnf versionlock add antrea

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-25804?

antrea: upgrade to 2.3.2, 2.4.3. Exact commands for each OS are on this page.

Is CVE-2026-25804 being exploited?

CVE-2026-25804 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-2026-25804 affect?

CVE-2026-25804 affects antrea. Severity is critical (CVSS 9.1). Antrea is a Kubernetes networking solution intended to be Kubernetes native. Prior to versions 2.3.2 and 2.4.3, Antrea's network policy priority assignment system has a uint16 arithmetic overflow bug that causes incorrect OpenFlow priority

How urgent is CVE-2026-25804?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Kubernetes vulnerabilities

Related CVEs

CVE-2026-34992 HIGH 7.5 UPGRADE Antrea is a Kubernetes networking solution intended to be Kubernetes native

References

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