{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-93137",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-93137"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "bpf: Fix use-after-free on mm_struct in bpf_find_vma()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free on mm_struct in bpf_find_vma()\n\nbpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without\nholding a reference on the mm. On a foreign task, a concurrent exit_mm()\ncan free the mm_struct between the lockless read and the trylock,\nresulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU.\n\nFor the current task, task->mm is stable. For a foreign task, pin the mm\nunder task->alloc_lock and release it with mmput_async(), mirroring commit\nd8e27d2d22b6 (\"bpf: fix mm lifecycle in open-coded task_vma iterator\").\nUse spin_trylock() instead of get_task_mm() so BPF context does not block\non alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the\nforeign-task path because dropping the mm reference is not safe there.\n\nRace:\n\n  CPU0 (BPF program)                  CPU1 (exiting task)\n  ============================        ==========================\n  bpf_find_vma(foreign_task):\n    mm = task->mm\n                                      exit_mm():\n                                        task->mm = NULL\n                                        mmput(mm) -> frees mm_struct\n    mmap_read_trylock(mm)\n        // UAF on mm",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-93137"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/db347840d6b6ee9bb9b8e4a985d4b4419f9f3200"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8e1101fc4118019a69c96ced4aec93164f89cbd5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c7ad910e987008e125eeff448892e86852173384"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/86d54cf069fc5ae2e111c87933bebf6eb527978e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2b2a903bee56d312539046d9defa8023eec94760"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/47b079e2117a2ee52e21f8b72935900c702fc0b5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - bpf_find_vma() is invoked only from a program loaded via bpf(BPF_PROG_LOAD): BPF_PROG_TYPE_SYSCALL (syscall_prog_func_proto) or tracing/raw_tp (bpf_tracing_func_proto), both reaching bpf_base_func_proto() for BPF_FUNC_find_vma. The stale mm comes from bpf_task_from_pid() or a tracing task argument, not from a remote protocol field.\nAC:L - The race is inside bpf_find_vma() between the lockless task->mm load and mmap_read_trylock(mm). The attacker forks a child, looks it up with bpf_task_from_pid(), and hammers BPF_PROG_RUN (or an attached raw_tp) while that child exits so exit_mm()\u2192mmput() frees the mm; they control both sides.\nPR:L - bpf_base_func_proto() returns bpf_find_vma_proto only after bpf_token_capable(CAP_PERFMON); bpf_prog_load() also needs CAP_BPF, and RAW_TRACEPOINT/TRACING fail is_perfmon_prog_type() without CAP_PERFMON. bpf_token_capable() uses ns_capable() on a delegated token's userns, so this is not init-namespace root.\nUI:N - The attacker loads the program with BPF_PROG_LOAD, runs it via BPF_PROG_RUN or their own attached probe, and exits their own child so exit_mm() races bpf_find_vma(); no other user must mount a filesystem or open a file.\nS:U - mmap_read_trylock() and find_vma() operate on the host kernel mm_struct that bpf_find_vma() cached from task->mm. That is in-kernel memory corruption in the same authority as the bpf() caller, not a KVM/Xen guest-to-host or IOMMU escape.\nC:H - After exit_mm() mmput() frees the mm_struct (mm_cachep is not SLAB_TYPESAFE_BY_RCU), bpf_find_vma() still calls find_vma(mm, start) and hands the resulting vm_area_struct to the BPF callback, so the program can read reallocated kernel VMA/mm memory.\nI:H - The stale mm is used by mmap_read_trylock() (down_read_trylock on mm->mmap_lock) and bpf_mmap_unlock_mm(); those write a freed mm_struct, and find_vma() may walk a reallocated maple tree, which is UAF corruption exploitable for an arbitrary kernel write.\nA:H - down_read_trylock on a freed mm->mmap_lock or find_vma() walking a freed mm->mm_mt oopses or panics the kernel, and the attacker can repeat bpf_find_vma() against children they exit."
    }
  }
}