---
cve: "CVE-2026-64524"
severity: "HIGH"
cvss: 7.7
epss: "14%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-07-25 10:17:38"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T13:20:54+02:00"
---

# CVE-2026-64524

> 7.7 HIGH

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 5.15.210
- Kernel ≥ 6.1.176
- Kernel ≥ 6.6.143
- Kernel ≥ 6.12.93
- Kernel ≥ 6.18.35
- Kernel ≥ 7.0.12

## Referenzen

- <https://git.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6>
- <https://git.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653>
- <https://git.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94>
- <https://git.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490>
- <https://git.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2a>
- <https://git.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5>
- <https://git.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-64524) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_