How severe is CVE-2026-25804?

CVE-2026-25804 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2026-25804 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25804?

CVE-2026-25804 affects Linuxfoundation Antrea. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25804?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-25804 have an EU (EUVD) identifier?

Yes. CVE-2026-25804 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6936.

When was CVE-2026-25804 published?

CVE-2026-25804 was published on 2026-02-06 and last updated on 2026-06-17.

CVE-2026-25804

CVE-2026-25804 is a critical-severity vulnerability in Linuxfoundation Antrea with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 8.0
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6936
Weakness: CWE-287
Affected product: Linuxfoundation Antrea
Published: 2026-02-06
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-25804?: 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.
How severe is CVE-2026-25804?: CVE-2026-25804 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2026-25804 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25804?: CVE-2026-25804 affects Linuxfoundation Antrea. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25804?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-25804 have an EU (EUVD) identifier?: Yes. CVE-2026-25804 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6936.
When was CVE-2026-25804 published?: CVE-2026-25804 was published on 2026-02-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:linuxfoundation:antrea:*:*:*:*:*:kubernetes:*:*

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