Vulnerability-Lookup

CVE-2026-80700 (GCVE-0-2026-80700)

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

Title

drm/vmwgfx: validate external BO copy bounds for both stride paths

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: validate external BO copy bounds for both stride paths vmw_external_bo_copy() trusts caller-supplied offsets, strides, and heights and operates on imported dma-buf vmaps: - The equal-stride memcpy() bound was clamped after subtracting the offsets from dst_size and src_size; an offset larger than the BO size wraps the unsigned subtraction to a huge value and the resulting memcpy() runs off the end of the vmap. dst_stride * height is also a u32 multiplication that can overflow. - The non-equal-stride row-by-row path had no bound at all. The loop touches bytes through offset + (height - 1) * stride + width_in_bytes, with only a WARN_ON(dst_stride < width_in_bytes), and could likewise step past the end of either mapping. The offsets and strides are derived from STDU/SOU plane state, so a configured CRTC submitting a crafted atomic commit on an imported framebuffer can reach this path. Validate the exact row-copy endpoint against each BO's size up front using check_mul_overflow() and check_add_overflow(). Use the bulk memcpy() path only when width_in_bytes covers the whole stride; otherwise copy one row at a time so partial-row updates near the bottom of a framebuffer remain valid. Also reject zero strides and stride < width_in_bytes, both of which the row-by-row path cannot represent safely.

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/4e0f669e2951b7422…
https://git.kernel.org/stable/c/e7b25a6011781ebfd…
https://git.kernel.org/stable/c/042ca38779554687f…
https://git.kernel.org/stable/c/5e4a2d15637a906cb…
https://git.kernel.org/stable/c/706c93c5813caabbb…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 9a9716bbbf3dd6b6cbefba3abcc89af8b72631f4 , < 4e0f669e2951b742239c6fe847fcc406fe78748d (git) Affected: 50f1199250912568606b3778dc56646c10cb7b04 , < e7b25a6011781ebfdbc458552cae6d4156732771 (git) Affected: 50f1199250912568606b3778dc56646c10cb7b04 , < 042ca38779554687fc32b66a28328e0d9a36c58f (git) Affected: 50f1199250912568606b3778dc56646c10cb7b04 , < 5e4a2d15637a906cbd9bc98e0bf969f5f713e344 (git) Affected: 50f1199250912568606b3778dc56646c10cb7b04 , < 706c93c5813caabbb0d0a576c017d15aeec2c113 (git) Affected: 5c12391ee1ab59cb2f3be3f1f5e6d0fc0c2dc854 (git) Affected: 6.6.49 , < 6.6.151 (semver) Affected: 6.10.8 , < 6.11 (semver)	guessed
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (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_blit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4e0f669e2951b742239c6fe847fcc406fe78748d",
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              "versionType": "git"
            },
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              "version": "6.10.8",
              "versionType": "semver"
            }
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_blit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "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": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.6.49",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.12.103",
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.10.8",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: validate external BO copy bounds for both stride paths\n\nvmw_external_bo_copy() trusts caller-supplied offsets, strides, and\nheights and operates on imported dma-buf vmaps:\n\n  - The equal-stride memcpy() bound was clamped after subtracting the\n    offsets from dst_size and src_size; an offset larger than the BO\n    size wraps the unsigned subtraction to a huge value and the\n    resulting memcpy() runs off the end of the vmap.  dst_stride *\n    height is also a u32 multiplication that can overflow.\n  - The non-equal-stride row-by-row path had no bound at all.  The\n    loop touches bytes through offset + (height - 1) * stride +\n    width_in_bytes, with only a WARN_ON(dst_stride \u003c width_in_bytes),\n    and could likewise step past the end of either mapping.\n\nThe offsets and strides are derived from STDU/SOU plane state, so a\nconfigured CRTC submitting a crafted atomic commit on an imported\nframebuffer can reach this path.\n\nValidate the exact row-copy endpoint against each BO\u0027s size up front\nusing check_mul_overflow() and check_add_overflow().  Use the bulk\nmemcpy() path only when width_in_bytes covers the whole stride;\notherwise copy one row at a time so partial-row updates near the bottom\nof a framebuffer remain valid.  Also reject zero strides and stride \u003c\nwidth_in_bytes, both of which the row-by-row path cannot represent\nsafely."
        }
      ],
      "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 - The flaw is reached only via local DRM KMS ioctls on /dev/dri/card0: DRM_IOCTL_MODE_ATOMIC drives STDU/SOU plane updates that call vmw_bo_cpu_blit() -\u003e vmw_external_bo_copy(); vmwgfx is not exposed through any network, adjacent-radio, or physical-bus interface.\nAC:L - An attacker with DRM master fully controls atomic plane state, damage clips, pitches, and prime-imported framebuffer geometry that derive dst/src offsets, strides, and height; crafted values reliably trigger unsigned wrap or unbounded row copies without races or victim-dependent layout.\nPR:L - DRM_IOCTL_MODE_ATOMIC is gated by DRM_MASTER, not real root; on VMware guests and VDI desktops the logged-in session user holding master (typical video/render group access) can prime-import a dma-buf, configure a CRTC, and submit the malicious atomic commit.\nUI:N - Exploitation requires only the attacker opening the DRM device and issuing crafted atomic commits with an imported framebuffer; no actions by another user such as mounting filesystems or opening files are needed.\nS:U - Out-of-bounds memcpy corrupts adjacent guest-kernel memory around imported dma-buf vmaps and internal display BO mappings, enabling guest-kernel privilege escalation; impact stays within the guest kernel security domain and does not directly cross a VM/host or IOMMU boundary.\nC:H - The bug performs unchecked memcpy from attacker-influenced source mappings past buffer ends (equal-stride unsigned underflow and unbounded row-by-row copies), yielding an out-of-bounds kernel read primitive that can disclose adjacent heap/vmalloc data including kernel pointers.\nI:H - The same unchecked copies write past the end of destination vmaps, providing an out-of-bounds kernel write primitive that can corrupt adjacent objects and be developed into arbitrary memory modification or code execution.\nA:H - Large out-of-bounds memcpy operations can immediately corrupt critical kernel structures or touch unmapped pages, causing kernel oops/panic; the atomic-commit trigger can be repeated to deny availability after reboot."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:20.794Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4e0f669e2951b742239c6fe847fcc406fe78748d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7b25a6011781ebfdbc458552cae6d4156732771"
        },
        {
          "url": "https://git.kernel.org/stable/c/042ca38779554687fc32b66a28328e0d9a36c58f"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e4a2d15637a906cbd9bc98e0bf969f5f713e344"
        },
        {
          "url": "https://git.kernel.org/stable/c/706c93c5813caabbb0d0a576c017d15aeec2c113"
        }
      ],
      "title": "drm/vmwgfx: validate external BO copy bounds for both stride paths",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80700",
    "datePublished": "2026-08-28T06:53:04.050Z",
    "dateReserved": "2026-08-26T14:34:25.786Z",
    "dateUpdated": "2026-08-29T06:22:20.794Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80700",
      "date": "2026-08-28",
      "epss": "0.00168",
      "percentile": "0.06272"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80700\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-28T08:16:55.517\",\"lastModified\":\"2026-08-29T07:16:51.807\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/vmwgfx: validate external BO copy bounds for both stride paths\\n\\nvmw_external_bo_copy() trusts caller-supplied offsets, strides, and\\nheights and operates on imported dma-buf vmaps:\\n\\n  - The equal-stride memcpy() bound was clamped after subtracting the\\n    offsets from dst_size and src_size; an offset larger than the BO\\n    size wraps the unsigned subtraction to a huge value and the\\n    resulting memcpy() runs off the end of the vmap.  dst_stride *\\n    height is also a u32 multiplication that can overflow.\\n  - The non-equal-stride row-by-row path had no bound at all.  The\\n    loop touches bytes through offset + (height - 1) * stride +\\n    width_in_bytes, with only a WARN_ON(dst_stride \u003c width_in_bytes),\\n    and could likewise step past the end of either mapping.\\n\\nThe offsets and strides are derived from STDU/SOU plane state, so a\\nconfigured CRTC submitting a crafted atomic commit on an imported\\nframebuffer can reach this path.\\n\\nValidate the exact row-copy endpoint against each BO\u0027s size up front\\nusing check_mul_overflow() and check_add_overflow().  Use the bulk\\nmemcpy() path only when width_in_bytes covers the whole stride;\\notherwise copy one row at a time so partial-row updates near the bottom\\nof a framebuffer remain valid.  Also reject zero strides and stride \u003c\\nwidth_in_bytes, both of which the row-by-row path cannot represent\\nsafely.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/gpu/drm/vmwgfx/vmwgfx_blit.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9a9716bbbf3dd6b6cbefba3abcc89af8b72631f4\",\"lessThan\":\"4e0f669e2951b742239c6fe847fcc406fe78748d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"50f1199250912568606b3778dc56646c10cb7b04\",\"lessThan\":\"e7b25a6011781ebfdbc458552cae6d4156732771\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"50f1199250912568606b3778dc56646c10cb7b04\",\"lessThan\":\"042ca38779554687fc32b66a28328e0d9a36c58f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"50f1199250912568606b3778dc56646c10cb7b04\",\"lessThan\":\"5e4a2d15637a906cbd9bc98e0bf969f5f713e344\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"50f1199250912568606b3778dc56646c10cb7b04\",\"lessThan\":\"706c93c5813caabbb0d0a576c017d15aeec2c113\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5c12391ee1ab59cb2f3be3f1f5e6d0fc0c2dc854\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.6.49\",\"lessThan\":\"6.6.151\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.10.8\",\"lessThan\":\"6.11\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/gpu/drm/vmwgfx/vmwgfx_blit.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.11\",\"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/042ca38779554687fc32b66a28328e0d9a36c58f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4e0f669e2951b742239c6fe847fcc406fe78748d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5e4a2d15637a906cbd9bc98e0bf969f5f713e344\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/706c93c5813caabbb0d0a576c017d15aeec2c113\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e7b25a6011781ebfdbc458552cae6d4156732771\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-80700

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/042ca38779554687fc32b66a28328e0d9a36c58f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4e0f669e2951b742239c6fe847fcc406fe78748d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5e4a2d15637a906cbd9bc98e0bf969f5f713e344
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/706c93c5813caabbb0d0a576c017d15aeec2c113
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e7b25a6011781ebfdbc458552cae6d4156732771

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_blit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4e0f669e2951b742239c6fe847fcc406fe78748d",
              "status": "affected",
              "version": "9a9716bbbf3dd6b6cbefba3abcc89af8b72631f4",
              "versionType": "git"
            },
            {
              "lessThan": "e7b25a6011781ebfdbc458552cae6d4156732771",
              "status": "affected",
              "version": "50f1199250912568606b3778dc56646c10cb7b04",
              "versionType": "git"
            },
            {
              "lessThan": "042ca38779554687fc32b66a28328e0d9a36c58f",
              "status": "affected",
              "version": "50f1199250912568606b3778dc56646c10cb7b04",
              "versionType": "git"
            },
            {
              "lessThan": "5e4a2d15637a906cbd9bc98e0bf969f5f713e344",
              "status": "affected",
              "version": "50f1199250912568606b3778dc56646c10cb7b04",
              "versionType": "git"
            },
            {
              "lessThan": "706c93c5813caabbb0d0a576c017d15aeec2c113",
              "status": "affected",
              "version": "50f1199250912568606b3778dc56646c10cb7b04",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5c12391ee1ab59cb2f3be3f1f5e6d0fc0c2dc854",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.151",
              "status": "affected",
              "version": "6.6.49",
              "versionType": "semver"
            },
            {
              "lessThan": "6.11",
              "status": "affected",
              "version": "6.10.8",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_blit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "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: validate external BO copy bounds for both stride paths\n\nvmw_external_bo_copy() trusts caller-supplied offsets, strides, and\nheights and operates on imported dma-buf vmaps:\n\n  - The equal-stride memcpy() bound was clamped after subtracting the\n    offsets from dst_size and src_size; an offset larger than the BO\n    size wraps the unsigned subtraction to a huge value and the\n    resulting memcpy() runs off the end of the vmap.  dst_stride *\n    height is also a u32 multiplication that can overflow.\n  - The non-equal-stride row-by-row path had no bound at all.  The\n    loop touches bytes through offset + (height - 1) * stride +\n    width_in_bytes, with only a WARN_ON(dst_stride \u003c width_in_bytes),\n    and could likewise step past the end of either mapping.\n\nThe offsets and strides are derived from STDU/SOU plane state, so a\nconfigured CRTC submitting a crafted atomic commit on an imported\nframebuffer can reach this path.\n\nValidate the exact row-copy endpoint against each BO\u0027s size up front\nusing check_mul_overflow() and check_add_overflow().  Use the bulk\nmemcpy() path only when width_in_bytes covers the whole stride;\notherwise copy one row at a time so partial-row updates near the bottom\nof a framebuffer remain valid.  Also reject zero strides and stride \u003c\nwidth_in_bytes, both of which the row-by-row path cannot represent\nsafely."
    }
  ],
  "id": "CVE-2026-80700",
  "lastModified": "2026-08-29T07:16:51.807",
  "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": "2026-08-28T08:16:55.517",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/042ca38779554687fc32b66a28328e0d9a36c58f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4e0f669e2951b742239c6fe847fcc406fe78748d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5e4a2d15637a906cbd9bc98e0bf969f5f713e344"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/706c93c5813caabbb0d0a576c017d15aeec2c113"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e7b25a6011781ebfdbc458552cae6d4156732771"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-C29C-H3VQ-MR67

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: validate external BO copy bounds for both stride paths

vmw_external_bo_copy() trusts caller-supplied offsets, strides, and heights and operates on imported dma-buf vmaps:

The equal-stride memcpy() bound was clamped after subtracting the offsets from dst_size and src_size; an offset larger than the BO size wraps the unsigned subtraction to a huge value and the resulting memcpy() runs off the end of the vmap. dst_stride * height is also a u32 multiplication that can overflow.
The non-equal-stride row-by-row path had no bound at all. The loop touches bytes through offset + (height - 1) * stride + width_in_bytes, with only a WARN_ON(dst_stride < width_in_bytes), and could likewise step past the end of either mapping.

The offsets and strides are derived from STDU/SOU plane state, so a configured CRTC submitting a crafted atomic commit on an imported framebuffer can reach this path.

Validate the exact row-copy endpoint against each BO's size up front using check_mul_overflow() and check_add_overflow(). Use the bulk memcpy() path only when width_in_bytes covers the whole stride; otherwise copy one row at a time so partial-row updates near the bottom of a framebuffer remain valid. Also reject zero strides and stride < width_in_bytes, both of which the row-by-row path cannot represent safely.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80700"
  ],
  "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: validate external BO copy bounds for both stride paths\n\nvmw_external_bo_copy() trusts caller-supplied offsets, strides, and\nheights and operates on imported dma-buf vmaps:\n\n  - The equal-stride memcpy() bound was clamped after subtracting the\n    offsets from dst_size and src_size; an offset larger than the BO\n    size wraps the unsigned subtraction to a huge value and the\n    resulting memcpy() runs off the end of the vmap.  dst_stride *\n    height is also a u32 multiplication that can overflow.\n  - The non-equal-stride row-by-row path had no bound at all.  The\n    loop touches bytes through offset + (height - 1) * stride +\n    width_in_bytes, with only a WARN_ON(dst_stride \u003c width_in_bytes),\n    and could likewise step past the end of either mapping.\n\nThe offsets and strides are derived from STDU/SOU plane state, so a\nconfigured CRTC submitting a crafted atomic commit on an imported\nframebuffer can reach this path.\n\nValidate the exact row-copy endpoint against each BO\u0027s size up front\nusing check_mul_overflow() and check_add_overflow().  Use the bulk\nmemcpy() path only when width_in_bytes covers the whole stride;\notherwise copy one row at a time so partial-row updates near the bottom\nof a framebuffer remain valid.  Also reject zero strides and stride \u003c\nwidth_in_bytes, both of which the row-by-row path cannot represent\nsafely.",
  "id": "GHSA-c29c-h3vq-mr67",
  "modified": "2026-08-28T09:31:49Z",
  "published": "2026-08-28T09:31:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80700"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/042ca38779554687fc32b66a28328e0d9a36c58f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e0f669e2951b742239c6fe847fcc406fe78748d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e4a2d15637a906cbd9bc98e0bf969f5f713e344"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/706c93c5813caabbb0d0a576c017d15aeec2c113"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7b25a6011781ebfdbc458552cae6d4156732771"
    }
  ],
  "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-2026-80700 (GCVE-0-2026-80700)

FKIE_CVE-2026-80700

GHSA-C29C-H3VQ-MR67

Tags

Sightings

Nomenclature