Skip to content
Heist/ feed
High

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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-80700

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-2026-80700

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": "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"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/vmwgfx/vmwgfx_blit.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/vmwgfx/vmwgfx_blit.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80700

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34359 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement