{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53085",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-53085"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "bpf: fix mm lifecycle in open-coded task_vma iterator",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix mm lifecycle in open-coded task_vma iterator\n\nThe open-coded task_vma iterator reads task->mm locklessly and acquires\nmmap_read_trylock() but never calls mmget(). If the task exits\nconcurrently, the mm_struct can be freed as it is not\nSLAB_TYPESAFE_BY_RCU, resulting in a use-after-free.\n\nSafely read task->mm with a trylock on alloc_lock and acquire an mm\nreference. Drop the reference via bpf_iter_mmput_async() in _destroy()\nand error paths. bpf_iter_mmput_async() is a local wrapper around\nmmput_async() with a fallback to mmput() on !CONFIG_MMU.\n\nReject irqs-disabled contexts (including NMI) up front. Operations used\nby _next() and _destroy() (mmap_read_unlock, bpf_iter_mmput_async)\ntake spinlocks with IRQs disabled (pool->lock, pi_lock). Running from\nNMI or from a tracepoint that fires with those locks held could\ndeadlock.\n\nA trylock on alloc_lock is used instead of the blocking task_lock()\n(get_task_mm) to avoid a deadlock when a softirq BPF program iterates\na task that already holds its alloc_lock on the same CPU.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53085"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/239cec25a22662dbd80f57d94b38178c8be95269"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d0862de7c866c5bd7c32531f66738c21197af888"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/43683bb280330f3d36f0f2a3932a4867b9603e9c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d8e27d2d22b6e2df3a0125b8c08e9aace38c954c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z"
  }
}