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drm/hyperv: validate resolution_count and fix WIN8 fallback

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-64524

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64524

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "76c56a5affeba1e163b66b9d8cc192e6154466f0",
        "lessThan": "96f7de3172d4aa878b7f87173b2b3507c350fcd6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76c56a5affeba1e163b66b9d8cc192e6154466f0",
        "lessThan": "bc573752f3dac0d1ab8df7078c1851bc76717653",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76c56a5affeba1e163b66b9d8cc192e6154466f0",
        "lessThan": "1fb565b77b8f44afabb02de6310065f109d89e94",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76c56a5affeba1e163b66b9d8cc192e6154466f0",
        "lessThan": "a321c908f2eeea01539668eb270d074d9b88e490",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76c56a5affeba1e163b66b9d8cc192e6154466f0",
        "lessThan": "9c698b2c43c2667c34f5336bf46ad5786216ac2a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76c56a5affeba1e163b66b9d8cc192e6154466f0",
        "lessThan": "8a114b25b5521eae451b13bce98ae978624962e5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "76c56a5affeba1e163b66b9d8cc192e6154466f0",
        "lessThan": "13d33b9ef67066c77c84273fac5a1d3fde3533d1",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/hyperv/hyperv_drm_proto.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.93",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.35",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.12",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/hyperv/hyperv_drm_proto.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64524

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41064 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-64524 · Revision 1Source updated