Vulnerability-Lookup

CVE-2026-80702 (GCVE-0-2026-80702)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:53 – Updated: 2026-08-29 06:22

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/21bbe38faee4a195d…
https://git.kernel.org/stable/c/9d6cbb76fe9cd7603…
https://git.kernel.org/stable/c/282f261cb035e5f01…
https://git.kernel.org/stable/c/3b2bb16a5b6228671…
https://git.kernel.org/stable/c/83195b778f2d109a3…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 668b206601c5f5063e03b76784a0d3024fa2b249 , < 21bbe38faee4a195d33a93e3908e307807f7745d (git) Affected: 668b206601c5f5063e03b76784a0d3024fa2b249 , < 9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6 (git) Affected: 668b206601c5f5063e03b76784a0d3024fa2b249 , < 282f261cb035e5f01a486f76d356b7e9dbfba73f (git) Affected: 668b206601c5f5063e03b76784a0d3024fa2b249 , < 3b2bb16a5b622867140d69925db411ac8ecb3b2b (git) Affected: 668b206601c5f5063e03b76784a0d3024fa2b249 , < 83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa (git)	guessed
Linux	Linux	Affected: 6.4 Unaffected: 0 , < 6.4 (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_resource.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "21bbe38faee4a195d33a93e3908e307807f7745d",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
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              "versionType": "git"
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_resource.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size\n\nTwo sites in vmwgfx_resource.c assign boolean literals to\nres-\u003eguest_memory_size, which is an unsigned long allocation-size\nfield; the intended target is the adjacent res-\u003eguest_memory_dirty\nbitfield.  After the assignments the field holds 0 or 1 instead of\nthe resource\u0027s MOB allocation size:\n\n  - vmw_resource_release()       writes 0 (false), and\n  - vmw_resource_unbind_list()   writes 1 (true).\n\nSubsequent revalidation paths read guest_memory_size when computing\nthe dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer\nallocation size (vmw_resource_buf_alloc()), producing zero-length\nwalks or wrap-around ranges that read or write past the MOB bitmap.\nThe dirty-tracking intent of the original code (mark the resource as\ndirtied since the last sync) is also lost, since guest_memory_dirty\nis never updated.\n\nRename both assignments to guest_memory_dirty."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Reachable only via local DRM ioctls on the vmwgfx render node (surface/context create-unref, DRM_VMW_EXECBUF, synccpu); vmw_resource_unbind_list runs from vmw_bo_move_notify during MOB eviction, not from any network or physical bus.\nAC:L - An unprivileged attacker controls the full GPU resource lifecycle and can force MOB moves plus subsequent revalidation (execbuf, memory pressure, destroy paths) to clobber guest_memory_size to 0/1 without races or victim-dependent heap layout.\nPR:L - Entry ioctls use DRM_RENDER_ALLOW, so any local user with access to /dev/dri/renderD* on a VMware SVGA guest can trigger vmw_resource_release or vmw_resource_unbind_list and the follow-on validate/dirty paths without init-namespace root.\nUI:N - Exploitation requires only the attacker opening the DRM render device and issuing crafted GPU resource operations; no additional actions by another user or administrator are needed.\nS:U - The bug corrupts guest-kernel vmwgfx MOB dirty-tracking and heap metadata during resource revalidation; impact is confined to the guest kernel security domain and does not directly cross a VM/host or IOMMU boundary.\nC:H - Clobbering guest_memory_size to 0 or 1 breaks dirty page-range math in vmw_bo_dirty_transfer_to_res and vmw_resource_buf_alloc, producing zero-length or wrap-around walks that read past the MOB dirty bitmap and adjacent kernel heap memory.\nI:H - The same corrupted size drives out-of-bounds bitmap_clear and dirty_sync operations past the MOB bitmap and undersized reallocations, yielding a kernel heap write primitive that can be leveraged for guest privilege escalation.\nA:H - Out-of-bounds MOB bitmap access and mis-sized buffer reallocation during revalidation after unbind or release can kernel-oops or panic the guest, providing a reliable denial-of-service against the VM."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:22.050Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6"
        },
        {
          "url": "https://git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b"
        },
        {
          "url": "https://git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa"
        }
      ],
      "title": "drm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80702",
    "datePublished": "2026-08-28T06:53:05.253Z",
    "dateReserved": "2026-08-26T14:34:25.786Z",
    "dateUpdated": "2026-08-29T06:22:22.050Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80702",
      "date": "2026-08-28",
      "epss": "0.00168",
      "percentile": "0.06267"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80702\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-28T08:16:55.740\",\"lastModified\":\"2026-08-29T07:16:51.943\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size\\n\\nTwo sites in vmwgfx_resource.c assign boolean literals to\\nres-\u003eguest_memory_size, which is an unsigned long allocation-size\\nfield; the intended target is the adjacent res-\u003eguest_memory_dirty\\nbitfield.  After the assignments the field holds 0 or 1 instead of\\nthe resource\u0027s MOB allocation size:\\n\\n  - vmw_resource_release()       writes 0 (false), and\\n  - vmw_resource_unbind_list()   writes 1 (true).\\n\\nSubsequent revalidation paths read guest_memory_size when computing\\nthe dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer\\nallocation size (vmw_resource_buf_alloc()), producing zero-length\\nwalks or wrap-around ranges that read or write past the MOB bitmap.\\nThe dirty-tracking intent of the original code (mark the resource as\\ndirtied since the last sync) is also lost, since guest_memory_dirty\\nis never updated.\\n\\nRename both assignments to guest_memory_dirty.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/gpu/drm/vmwgfx/vmwgfx_resource.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"668b206601c5f5063e03b76784a0d3024fa2b249\",\"lessThan\":\"21bbe38faee4a195d33a93e3908e307807f7745d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"668b206601c5f5063e03b76784a0d3024fa2b249\",\"lessThan\":\"9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"668b206601c5f5063e03b76784a0d3024fa2b249\",\"lessThan\":\"282f261cb035e5f01a486f76d356b7e9dbfba73f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"668b206601c5f5063e03b76784a0d3024fa2b249\",\"lessThan\":\"3b2bb16a5b622867140d69925db411ac8ecb3b2b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"668b206601c5f5063e03b76784a0d3024fa2b249\",\"lessThan\":\"83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/gpu/drm/vmwgfx/vmwgfx_resource.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-80702

Vulnerability from fkie_nvd - Published: 2026-08-28 08:16 - Updated: 2026-08-29 07:16

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_resource.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "21bbe38faee4a195d33a93e3908e307807f7745d",
              "status": "affected",
              "version": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "versionType": "git"
            },
            {
              "lessThan": "9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6",
              "status": "affected",
              "version": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "versionType": "git"
            },
            {
              "lessThan": "282f261cb035e5f01a486f76d356b7e9dbfba73f",
              "status": "affected",
              "version": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "versionType": "git"
            },
            {
              "lessThan": "3b2bb16a5b622867140d69925db411ac8ecb3b2b",
              "status": "affected",
              "version": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "versionType": "git"
            },
            {
              "lessThan": "83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa",
              "status": "affected",
              "version": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_resource.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size\n\nTwo sites in vmwgfx_resource.c assign boolean literals to\nres-\u003eguest_memory_size, which is an unsigned long allocation-size\nfield; the intended target is the adjacent res-\u003eguest_memory_dirty\nbitfield.  After the assignments the field holds 0 or 1 instead of\nthe resource\u0027s MOB allocation size:\n\n  - vmw_resource_release()       writes 0 (false), and\n  - vmw_resource_unbind_list()   writes 1 (true).\n\nSubsequent revalidation paths read guest_memory_size when computing\nthe dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer\nallocation size (vmw_resource_buf_alloc()), producing zero-length\nwalks or wrap-around ranges that read or write past the MOB bitmap.\nThe dirty-tracking intent of the original code (mark the resource as\ndirtied since the last sync) is also lost, since guest_memory_dirty\nis never updated.\n\nRename both assignments to guest_memory_dirty."
    }
  ],
  "id": "CVE-2026-80702",
  "lastModified": "2026-08-29T07:16:51.943",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-28T08:16:55.740",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-736R-87MH-H3GR

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-28 09:31

Details

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.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80702"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:55Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size\n\nTwo sites in vmwgfx_resource.c assign boolean literals to\nres-\u003eguest_memory_size, which is an unsigned long allocation-size\nfield; the intended target is the adjacent res-\u003eguest_memory_dirty\nbitfield.  After the assignments the field holds 0 or 1 instead of\nthe resource\u0027s MOB allocation size:\n\n  - vmw_resource_release()       writes 0 (false), and\n  - vmw_resource_unbind_list()   writes 1 (true).\n\nSubsequent revalidation paths read guest_memory_size when computing\nthe dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer\nallocation size (vmw_resource_buf_alloc()), producing zero-length\nwalks or wrap-around ranges that read or write past the MOB bitmap.\nThe dirty-tracking intent of the original code (mark the resource as\ndirtied since the last sync) is also lost, since guest_memory_dirty\nis never updated.\n\nRename both assignments to guest_memory_dirty.",
  "id": "GHSA-736r-87mh-h3gr",
  "modified": "2026-08-28T09:31:50Z",
  "published": "2026-08-28T09:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80702"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-80702 (GCVE-0-2026-80702)

FKIE_CVE-2026-80702

GHSA-736R-87MH-H3GR

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