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Review reviewHigh

CVE-2026-64524

Linux

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 user...

CVSS
7.7
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.7

Vulnerability overview

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 user...

Affected product and versions

Product
Linux
Affected versions
>= 76c56a5affeba1e163b66b9d8cc192e6154466f0 < 96f7de3172d4aa878b7f87173b2b3507c350fcd6, >= 76c56a5affeba1e163b66b9d8cc192e6154466f0 < bc573752f3dac0d1ab8df7078c1851bc76717653, >= 76c56a5affeba1e163b66b9d8cc192e6154466f0 < 1fb565b77b8f44afabb02de6310065f109d89e94, >= 76c56a5affeba1e163b66b9d8cc192e6154466f0 < a321c908f2eeea01539668eb270d074d9b88e490, >= 76c56a5affeba1e163b66b9d8cc192e6154466f0 < 9c698b2c43c2667c34f5336bf46ad5786216ac2a, >= 76c56a5affeba1e163b66b9d8cc192e6154466f0 < 8a114b25b5521eae451b13bce98ae978624962e5, >= 76c56a5affeba1e163b66b9d8cc192e6154466f0 < 13d33b9ef67066c77c84273fac5a1d3fde3533d1, >= 5.14
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CWE
Not available