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CVE-2026-79609

8.8 · HIGH

XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown (CVE-2017-5754, one aspect of XSA-254).

Published Oct 13, 2026CWE-284EPSS 0.11%

Overview

CVE-2026-79609 is a high-severity vulnerability. It was published on October 13, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown

(CVE-2017-5754, one aspect of XSA-254). This involves copying 64-bit PV

guest page table entries from guest-chosen root page tables to the Xen-

chosen one which is in actual use by hardware. To read the guest root

page table, the directmap is used. PV guests, however, have a directmap

which may not cover all memory; in particular this is the case if any

memory extends beyond the 5 TiB (CONFIG_BIGMEM=y: 3.5 TiB) address

boundary.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refxenbits.xenproject.org/xsa/advisory-516.htmlRefxenbits.xen.org/xsa/advisory-516.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-79609?

CVE-2026-79609 is a high-severity vulnerability. It was published on October 13, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-79609?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-79609?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-79609?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-79609 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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