{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-45837",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-45837"
  ],
  "published": "2026-05-27T09:24:19Z",
  "summary": "bpf: Fix use-after-free in arena_vm_close on fork",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free in arena_vm_close on fork\n\narena_vm_open() only bumps vml->mmap_count but never registers the\nchild VMA in arena->vma_list. The vml->vma always points at the\nparent VMA, so after parent munmap the pointer dangles. If the child\nthen calls bpf_arena_free_pages(), zap_pages() reads the stale\nvml->vma triggering use-after-free.\n\nFix this by preventing the arena VMA from being inherited across\nfork with VM_DONTCOPY, and preventing VMA splits via the may_split\ncallback.\n\nAlso reject mremap with a .mremap callback returning -EINVAL. A\nsame-size mremap(MREMAP_FIXED) on the full arena VMA reaches\ncopy_vma() through the following path:\n\n  check_prep_vma()       - returns 0 early: new_len == old_len\n                           skips VM_DONTEXPAND check\n  prep_move_vma()        - vm_start == old_addr and\n                           vm_end == old_addr + old_len\n                           so may_split is never called\n  move_vma()\n    copy_vma_and_data()\n      copy_vma()\n        vm_area_dup()    - copies vm_private_data (vml pointer)\n        vm_ops->open()   - bumps vml->mmap_count\n      vm_ops->mremap()   - returns -EINVAL, rollback unmaps new VMA\n\nThe refcount ensures the rollback's arena_vm_close does not free\nthe vml shared with the original VMA.",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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        "1:6.12.25-1+rpt1",
        "1:6.12.34-1+rpt1~bookworm",
        "1:6.12.47-1+rpt1~bookworm",
        "1:6.12.62-1+rpt1~bookworm",
        "1:6.12.75-1+rpt1~bookworm",
        "1:6.12.87-1+rpt1~bookworm"
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      "ecosystem_specific": {
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          },
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          },
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            "binary_version": "1:6.12.25-1+rpt1"
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            "binary_version": "1:6.12.25-1+rpt1"
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            "binary_version": "1:6.12.34-1+rpt1~bookworm"
          },
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      "database_specific": {
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        "name": "linux"
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45837"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/723b9fa930cc277c15ce6b9ec9feec828cfac9d7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d18099f19e53250f8ad2801498b88cec29d9107a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/201128fcc7b213d27ab77bc4e89488b41796480f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4fddde2a732de60bb97e3307d4eb69ac5f1d2b74"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-06-15T02:03:26Z"
  }
}