{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-39497",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-39497"
  ],
  "published": "2024-07-12T12:21:19Z",
  "summary": "drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)\n\nLack of check for copy-on-write (COW) mapping in drm_gem_shmem_mmap\nallows users to call mmap with PROT_WRITE and MAP_PRIVATE flag\ncausing a kernel panic due to BUG_ON in vmf_insert_pfn_prot:\nBUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags));\n\nReturn -EINVAL early if COW mapping is detected.\n\nThis bug affects all drm drivers using default shmem helpers.\nIt can be reproduced by this simple example:\nvoid *ptr = mmap(0, size, PROT_WRITE, MAP_PRIVATE, fd, mmap_offset);\nptr[0] = 0;",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-39497"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a508a102edf8735adc9bb73d37dd13c38d1a1b10"
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      "url": "https://git.kernel.org/stable/c/3ae63a8c1685e16958560ec08d30defdc5b9cca0"
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      "url": "https://git.kernel.org/stable/c/2219e5f97244b79c276751a1167615b9714db1b0"
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      "url": "https://git.kernel.org/stable/c/03c71c42809ef4b17f5d874cdb2d3bf40e847b86"
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    "upstream_modified": "2026-05-12T04:54:46Z"
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}