CVE-2026-64524

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 v3 7.7 HIGH

7.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.5 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

No configuration.

History

19 Oct 2026, 21:17

Type	Values Removed	Values Added
CWE		CWE-122

Information

Published : 2026-07-25 10:17

Updated : 2026-10-19 21:17

NVD link : CVE-2026-64524

Mitre link : CVE-2026-64524

CVE.ORG link : CVE-2026-64524

JSON object : View

Products Affected

No product.

CWE

CWE-122

Heap-based Buffer Overflow

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Bound resolution_count against the array size, folded\ninto the existing zero-check.\n\nWhen the WIN10 resolution probe fails, the caller in\nhyperv_connect_vsp() left hv->screen_*_max / preferred_* unpopulated,\nwhich sets mode_config.max_width / max_height to 0 and makes\ndrm_internal_framebuffer_create() reject every userspace framebuffer\nwith -EINVAL. The pre-WIN10 branch had the same gap for\npreferred_width / preferred_height. Use a single post-probe fallback\nguarded by screen_width_max == 0 so both paths converge on the WIN8\ndefaults."}], "lastModified": "2026-10-19T21:17:41.977", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}