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CVE-2026-64524

7.7 · HIGH

In the Linux kernel, the following vulnerability has been resolved: drm/hyperv: validate resolution_count and fix WIN8 fallback A SYNTHVID_RESOLUTION_RESPONSE with resolution_count > 64 walks pas…

Published Jul 25, 2026EPSS 0.14%

Overview

CVE-2026-64524 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/hyperv: validate resolution_count and fix WIN8 fallback

A SYNTHVID_RESOLUTION_RESPONSE with resolution_count > 64 walks past

the supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT] array in the

parse loop. Bound resolution_count against the array size, folded

into the existing zero-check.

When the WIN10 resolution probe fails, the caller in

hyperv_connect_vsp() left hv->screen_*_max / preferred_* unpopulated,

which sets mode_config.max_width / max_height to 0 and makes

drm_internal_framebuffer_create() reject every userspace framebuffer

with -EINVAL. The pre-WIN10 branch had the same gap for

preferred_width / preferred_height. Use a single post-probe fallback

guarded by screen_width_max == 0 so both paths converge on the WIN8

defaults.

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

Refgit.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1Refgit.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94Refgit.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5Refgit.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6Refgit.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2aRefgit.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490Refgit.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64524?

CVE-2026-64524 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-64524?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-64524?

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-2026-64524?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64524 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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