{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "463873d5701427f2964a0b4b72c45f1f14b6df87"
            },
            {
              "fixed": "9f0ee411fc2d76333d6087c5862ffa907cf7a175"
            },
            {
              "fixed": "019e6ad247f7fd038d2e009789f6d9bfcccb1ae7"
            },
            {
              "fixed": "6deaa317201851c644c431b57682e54d06b35838"
            },
            {
              "fixed": "fe168ef1d232d734d9998fd74822e2e20930dfff"
            },
            {
              "fixed": "0c9e6367639548307d3f578f6943ce72c9d39087"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.5.0"
            },
            {
              "fixed": "6.6.148"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.42"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68445.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Prevent shader BO mappings from becoming writable\n\nvc4_gem_object_mmap() rejects a writable mapping of a validated shader\nBO, but leaves VM_MAYWRITE set.  Userspace can map the BO read-only and\nthen turn it writable with mprotect().\n\nValidated shader BOs must stay read-only: the validator checks the\ninstructions once and the GPU trusts them afterwards.  A writable\nmapping lets userspace rewrite the code after validation, bypassing the\nvalidator.\n\nClear VM_MAYWRITE on the read-only path so the mapping cannot be\nupgraded, as i915 already does for its read-only objects.",
  "id": "CVE-2026-68445",
  "modified": "2026-08-13T03:51:41.807310591Z",
  "published": "2026-08-12T00:07:36.230Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/019e6ad247f7fd038d2e009789f6d9bfcccb1ae7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c9e6367639548307d3f578f6943ce72c9d39087"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6deaa317201851c644c431b57682e54d06b35838"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f0ee411fc2d76333d6087c5862ffa907cf7a175"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe168ef1d232d734d9998fd74822e2e20930dfff"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68445.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68445"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "drm/vc4: Prevent shader BO mappings from becoming writable"
}