{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "9a9716bbbf3dd6b6cbefba3abcc89af8b72631f4"
            },
            {
              "fixed": "4e0f669e2951b742239c6fe847fcc406fe78748d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "50f1199250912568606b3778dc56646c10cb7b04"
            },
            {
              "fixed": "e7b25a6011781ebfdbc458552cae6d4156732771"
            },
            {
              "fixed": "042ca38779554687fc32b66a28328e0d9a36c58f"
            },
            {
              "fixed": "5e4a2d15637a906cbd9bc98e0bf969f5f713e344"
            },
            {
              "fixed": "706c93c5813caabbb0d0a576c017d15aeec2c113"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "5c12391ee1ab59cb2f3be3f1f5e6d0fc0c2dc854"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.49"
            },
            {
              "fixed": "6.6.151"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.10.8"
            },
            {
              "fixed": "6.11"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.6.151"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.103"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.11.0"
            },
            {
              "fixed": "6.18.44"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "7.1.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80700.json"
  },
  "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's 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",
  "modified": "2026-08-31T03:31:04.639416909Z",
  "published": "2026-08-28T06:53:04.050Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80700.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80700"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "drm/vmwgfx: validate external BO copy bounds for both stride paths"
}