How severe is CVE-2025-26403?

CVE-2025-26403 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-26403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-26403?

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

Does CVE-2025-26403 have an EU (EUVD) identifier?

Yes. CVE-2025-26403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24395.

When was CVE-2025-26403 published?

CVE-2025-26403 was published on 2025-08-12 and last updated on 2026-06-17.

CVE-2025-26403

CVE-2025-26403 is a high-severity vulnerability with a CVSS 3.x base score of 7.2. 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v4: 4.5
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-24395
Weakness: CWE-787
Published: 2025-08-12
Last modified: 2026-06-17

Description

Out-of-bounds write in the memory subsystem for some Intel(R) Xeon(R) 6 processors when using Intel(R) SGX or Intel(R) TDX may allow a privileged user to potentially enable escalation of privilege via local access.

Frequently asked questions

What is CVE-2025-26403?: Out-of-bounds write in the memory subsystem for some Intel(R) Xeon(R) 6 processors when using Intel(R) SGX or Intel(R) TDX may allow a privileged user to potentially enable escalation of privilege via local access.
How severe is CVE-2025-26403?: CVE-2025-26403 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-26403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-26403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-26403 have an EU (EUVD) identifier?: Yes. CVE-2025-26403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24395.
When was CVE-2025-26403 published?: CVE-2025-26403 was published on 2025-08-12 and last updated on 2026-06-17.

References

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