drm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size

{
  "id": "d2b3546ad7eee5c2ecf2f8001d505345efd6a8082b4827f854fa3793ec722600",
  "url": "https://osv.dev/vulnerability/CVE-2026-80702",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size Two sites in vmwgfx_resource.c assign boolean literals to res->guest_memory_size, which is an unsigned long allocation-size field; the intended target is the adjacent res->guest_memory_dirty bitfield. After the assignments the field holds 0 or 1 instead of the resource's MOB allocation size: - vmw_resource_release() writes 0 (false), and - vmw_resource_unbind_list() writes 1 (true). Subsequent revalidation paths read guest_memory_size when computing the dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer allocation size (vmw_resource_buf_alloc()), producing zero-length walks or wrap-around ranges that read or write past the MOB bitmap. The dirty-tracking intent of the original code (mark the resource as dirtied since the last sync) is also lost, since guest_memory_dirty is never updated. Rename both assignments to guest_memory_dirty.",
    "evidence": "osv:CVE-2026-80702",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
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    "severity": "high",
    "structured": {
      "id": "CVE-2026-80702",
      "aliases": [
        "CVE-2026-80702"
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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            "ecosystem": "Linux"
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      "modified": "2026-10-28T02:30:25.903595015Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d",
        "https://git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f",
        "https://git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b",
        "https://git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa",
        "https://git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80702.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80702",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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        "cna_assigner": "Linux",
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 492605,
  "published_at": "2026-08-28T06:53:05.253+00:00"
}