GHSA-2RHV-CG46-XRX8

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64524"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:38Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/hyperv: validate resolution_count and fix WIN8 fallback\n\nA SYNTHVID_RESOLUTION_RESPONSE with resolution_count \u003e 64 walks past\nthe supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT] array in the\nparse loop. 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-\u003escreen_*_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.",
  "id": "GHSA-2rhv-cg46-xrx8",
  "modified": "2026-07-25T12:31:39Z",
  "published": "2026-07-25T12:31:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64524"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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