drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)

{
  "id": "d9ecbfa72a6d20ced03514f767584d9ef308aba33cb1bc4108b6d594452df24a",
  "url": "https://osv.dev/vulnerability/CVE-2024-39497",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE) Lack of check for copy-on-write (COW) mapping in drm_gem_shmem_mmap allows users to call mmap with PROT_WRITE and MAP_PRIVATE flag causing a kernel panic due to BUG_ON in vmf_insert_pfn_prot: BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags)); Return -EINVAL early if COW mapping is detected. This bug affects all drm drivers using default shmem helpers. It can be reproduced by this simple example: void *ptr = mmap(0, size, PROT_WRITE, MAP_PRIVATE, fd, mmap_offset); ptr[0] = 0;",
    "evidence": "osv:CVE-2024-39497",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.229",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.169",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.114",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.35",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.9.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-39497",
      "aliases": [
        "CVE-2024-39497"
      ],
      "affected": [
        {
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              "type": "GIT",
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                  "fixed": "2219e5f97244b79c276751a1167615b9714db1b0"
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                  "fixed": "1b4a8b89bf6787090b56424d269bf84ba00c3263"
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                {
                  "fixed": "03c71c42809ef4b17f5d874cdb2d3bf40e847b86"
                },
                {
                  "fixed": "39bc27bd688066a63e56f7f64ad34fae03fbe3b8"
                }
              ]
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-39497.json"
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          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "5.2.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-39497.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.181774066Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/03c71c42809ef4b17f5d874cdb2d3bf40e847b86",
        "https://git.kernel.org/stable/c/1b4a8b89bf6787090b56424d269bf84ba00c3263",
        "https://git.kernel.org/stable/c/2219e5f97244b79c276751a1167615b9714db1b0",
        "https://git.kernel.org/stable/c/39bc27bd688066a63e56f7f64ad34fae03fbe3b8",
        "https://git.kernel.org/stable/c/3ae63a8c1685e16958560ec08d30defdc5b9cca0",
        "https://git.kernel.org/stable/c/a508a102edf8735adc9bb73d37dd13c38d1a1b10",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/39xxx/CVE-2024-39497.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-39497",
        "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/2024/39xxx/CVE-2024-39497.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-39497",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493616,
  "published_at": "2024-07-12T12:20:32.33+00:00"
}