High 7.7Published Jul 25, 2026

CVE-2026-64524drm/hyperv: validate resolution_count and fix WIN8 fallback

Updated under an hour ago (Oct 28, 2026, 6:30 AM ET)

Does this affect you?

It affects Linux. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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: 7.7 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): CWE-122
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 76c56a5affeba1e163b66b9d8cc192e6154466f0 before 96f7de3172d4aa878b7f87173b2b3507c350fcd6; from 76c56a5affeba1e163b66b9d8cc192e6154466f0 before bc573752f3dac0d1ab8df7078c1851bc76717653; 76c56a5affeba1e163b66b9d8cc192e6154466f0 builds before 1fb565b77b8f44afabb02de6310065f109d89e94; from 76c56a5affeba1e163b66b9d8cc192e6154466f0 before a321c908f2eeea01539668eb270d074d9b88e490; 76c56a5affeba1e163b66b9d8cc192e6154466f0 builds before 9c698b2c43c2667c34f5336bf46ad5786216ac2a; 76c56a5affeba1e163b66b9d8cc192e6154466f0 builds before 8a114b25b5521eae451b13bce98ae978624962e5; 76c56a5affeba1e163b66b9d8cc192e6154466f0 builds before 13d33b9ef67066c77c84273fac5a1d3fde3533d1	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.