drm/sysfb: Avoid possible truncation with calculating visible size

{
  "id": "82136cfa2380cede344702d7161e5938bb91e18ea8351ca0f2d52ad2a6512302",
  "url": "https://osv.dev/vulnerability/CVE-2026-68270",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/sysfb: Avoid possible truncation with calculating visible size",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/sysfb: Avoid possible truncation with calculating visible size Calculating the visible size of the system framebuffer can result in truncation of the result. The calculation uses 32-bit arithmetics, which can overflow if the values for height and stride are large. Fix the issue by multiplying with mul_u32_u32().",
    "evidence": "osv:CVE-2026-68270",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-68270",
      "aliases": [
        "CVE-2026-68270"
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
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          "database_specific": {
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.18.42"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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                {
                  "fixed": "7.1.6"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68270.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.451057449Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/154795885e8f0033c918c815aece543168bee670",
        "https://git.kernel.org/stable/c/9d58a811739a365cd693192f4b5344d736967a88",
        "https://git.kernel.org/stable/c/b771974988ec7ce077a7246fa0fa588c246fe581",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68270.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68270",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68270.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68270",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 499684,
  "published_at": "2026-08-10T12:01:45.569+00:00"
}