FKIE_CVE-2026-80701

Vulnerability from fkie_nvd - Published: 2026-08-28 08:16 - Updated: 2026-08-28 08:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: enforce cursor size limits for MOB cursors vmw_cursor_plane_atomic_check() bounds cursor width and height only on the legacy update path; the SVGA_CAP2_CURSOR_MOB path -- the default on modern hosts -- accepts any size. When the requested size exceeds SVGA_REG_CURSOR_MAX_DIMENSION or SVGA_REG_MOB_MAX_SIZE, vmw_cursor_mob_get() returns -EINVAL and leaves vps->cursor.mob NULL. Its return value is then discarded in vmw_cursor_plane_prepare_fb(), so the subsequent vmw_cursor_update_mob() calls vmw_bo_map_and_cache(NULL) and oopses inside vmw_bo_map_and_cache_size() on the tbo.base.size load. Reachable from any DRM master via DRM_IOCTL_MODE_CURSOR2 with a sufficiently large width or height (e.g. cursor_max_dim + 1). Reject oversized cursors in atomic_check for both MOB-backed cursor update types. The MOB byte-size limit only applies to the SVGA_CAP2_CURSOR_MOB path (vmw_cursor_mob_size() returns 0 for GB_ONLY); compute the required MOB size in 64-bit to avoid overflow when very large dimensions are requested. In prepare_fb only call vmw_cursor_mob_get()/_map() for VMW_CURSOR_UPDATE_MOB -- the GB_ONLY path uses bo->map.virtual directly and would otherwise be silently downgraded to NONE on hosts without SVGA_CAP2_CURSOR_MOB (where vmw_cursor_mob_get() always returns -EINVAL). Degrade the update to NONE if vmw_cursor_mob_get() or vmw_cursor_mob_map() fails so the update path does not run with a NULL backing MOB.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1eb4f796695be39e0b5c4383350033ced9ade703
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9109b7935b9c058b75348610ef8437c52f9020e3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d5ed8749168ad13c0dbaa8300f68d854b6076966
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_cursor_plane.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1eb4f796695be39e0b5c4383350033ced9ade703",
              "status": "affected",
              "version": "965544150d1cadf0e8f5bb6c13c19697e46e1429",
              "versionType": "git"
            },
            {
              "lessThan": "9109b7935b9c058b75348610ef8437c52f9020e3",
              "status": "affected",
              "version": "965544150d1cadf0e8f5bb6c13c19697e46e1429",
              "versionType": "git"
            },
            {
              "lessThan": "d5ed8749168ad13c0dbaa8300f68d854b6076966",
              "status": "affected",
              "version": "965544150d1cadf0e8f5bb6c13c19697e46e1429",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_cursor_plane.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "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: enforce cursor size limits for MOB cursors\n\nvmw_cursor_plane_atomic_check() bounds cursor width and height only\non the legacy update path; the SVGA_CAP2_CURSOR_MOB path -- the\ndefault on modern hosts -- accepts any size.  When the requested size\nexceeds SVGA_REG_CURSOR_MAX_DIMENSION or SVGA_REG_MOB_MAX_SIZE,\nvmw_cursor_mob_get() returns -EINVAL and leaves vps-\u003ecursor.mob NULL.\nIts return value is then discarded in vmw_cursor_plane_prepare_fb(),\nso the subsequent vmw_cursor_update_mob() calls\nvmw_bo_map_and_cache(NULL) and oopses inside\nvmw_bo_map_and_cache_size() on the tbo.base.size load.\n\nReachable from any DRM master via DRM_IOCTL_MODE_CURSOR2 with a\nsufficiently large width or height (e.g. cursor_max_dim + 1).\n\nReject oversized cursors in atomic_check for both MOB-backed cursor\nupdate types.  The MOB byte-size limit only applies to the\nSVGA_CAP2_CURSOR_MOB path (vmw_cursor_mob_size() returns 0 for\nGB_ONLY); compute the required MOB size in 64-bit to avoid overflow\nwhen very large dimensions are requested.\n\nIn prepare_fb only call vmw_cursor_mob_get()/_map() for\nVMW_CURSOR_UPDATE_MOB -- the GB_ONLY path uses bo-\u003emap.virtual\ndirectly and would otherwise be silently downgraded to NONE on hosts\nwithout SVGA_CAP2_CURSOR_MOB (where vmw_cursor_mob_get() always\nreturns -EINVAL).  Degrade the update to NONE if vmw_cursor_mob_get()\nor vmw_cursor_mob_map() fails so the update path does not run with a\nNULL backing MOB."
    }
  ],
  "id": "CVE-2026-80701",
  "lastModified": "2026-08-28T08:16:55.640",
  "metrics": {},
  "published": "2026-08-28T08:16:55.640",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1eb4f796695be39e0b5c4383350033ced9ade703"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9109b7935b9c058b75348610ef8437c52f9020e3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d5ed8749168ad13c0dbaa8300f68d854b6076966"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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