{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72175",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72175"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "fs/proc/task_mmu: fix make_uffd_wp_huge_pte() prot-update race",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/proc/task_mmu: fix make_uffd_wp_huge_pte() prot-update race\n\nPatch series \"userfaultfd/pagemap: pre-existing fixes\".\n\nThese are pre-existing bug fixes that were carried at the front of the\nuserfaultfd RWP working-set-tracking series up to v5 [1].  Per review\nfeedback that fixes should not sit in the middle of a feature series, they\nare split out and sent on their own; the RWP series is reposted rebased on\ntop of this.\n\nAll six were flagged by the Sashiko AI review of the RWP series and carry\nindependent of RWP, apply to mm-new directly, and carry Cc: stable@.\n\n  1: fs/proc/task_mmu: a missing huge_ptep_modify_prot_start() in\n     make_uffd_wp_huge_pte() can lose hardware Dirty/Accessed updates\n     when PAGEMAP_SCAN write-protects a hugetlb PTE.\n\n  2: fs/proc/task_mmu: pagemap_scan_hugetlb_entry() compares the range\n     against HPAGE_SIZE rather than the hstate page size, so it never\n     write-protects gigantic hugetlb pages.\n\n  3: fs/proc/task_mmu: PAGEMAP_SCAN with PM_SCAN_WP_MATCHING over an\n     unpopulated hugetlb range self-deadlocks -- pagemap_scan_pte_hole()\n     calls uffd_wp_range() while walk_hugetlb_range() holds the hugetlb\n     vma lock for read, and hugetlb_change_protection() then takes it\n     for write. Install the marker inline instead.\n\n  4: mm/huge_memory: change_non_present_huge_pmd() drops pmd_swp_uffd_wp\n     on a device-private PMD permission downgrade, silently losing the\n     uffd-wp marker.\n\n  5: userfaultfd: must_wait() applies pte_write() to a locklessly read\n     PTE without checking pte_present(), so swap/migration entries\n     decode random offset bits and a thread can stay parked on a stale\n     fault.\n\n  6: userfaultfd: __VMA_UFFD_FLAGS feeds VMA_UFFD_MINOR_BIT (41) to\n     mk_vma_flags() unconditionally, an out-of-bounds write into the\n     single-word vma_flags_t on 32-bit. Build the mask from config-gated\n     per-mode masks so an unavailable bit is never materialised.\n\n\nThis patch (of 6):\n\nmake_uffd_wp_huge_pte() arms the UFFD_WP bit on a present HugeTLB PTE by\ncalling huge_ptep_modify_prot_commit() with a ptent snapshot that was\nfetched without the corresponding huge_ptep_modify_prot_start().  The\nstart helper is what atomically clears the entry so the kernel-owned\nsnapshot stays consistent until the commit; without it, the hardware may\nset Dirty or Accessed in the live PTE between the original read and the\ncommit, and huge_ptep_modify_prot_commit() (whose generic implementation\njust calls set_huge_pte_at()) then writes the stale snapshot back over the\nlive hardware bits, losing the update.\n\nThe non-hugetlb sibling make_uffd_wp_pte() does this correctly via\nptep_modify_prot_start() / ptep_modify_prot_commit().  Mirror that pattern\nfor the present-PTE branch.  The migration case stays as-is -- migration\nentries are non-present, so there's no hardware update to race against.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72175"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/50a25249a6355db74c2c1b6be541b4caab9f3655"
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      "url": "https://git.kernel.org/stable/c/8e39ed92d7c5c6bfc08dc45153916f49a4e98bab"
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      "url": "https://git.kernel.org/stable/c/6b7f774b8882445d9174681747d37c42548686a4"
    },
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      "url": "https://git.kernel.org/stable/c/04718f7c9290f95385f0dd328758753dc1c36dec"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only through the PAGEMAP_SCAN ioctl on /proc/<pid>/pagemap, which requires local access to a process address space and cannot be triggered remotely.\nAC:L - The attacker controls both sides of the race by issuing PAGEMAP_SCAN with PM_SCAN_WP_MATCHING while concurrently writing the same present HugeTLB page from another thread in the target process.\nPR:L - Any unprivileged local user can open /proc/self/pagemap and trigger the ioctl; ptrace read checks also allow same-UID access to another process's pagemap without real root privileges.\nUI:N - No victim user action is required; exploitation is performed entirely by the attacker ioctl-ing pagemap and racing writes against their own or same-UID process mappings.\nS:U - The vulnerability corrupts PTE metadata within the target mm only and does not cross VM, container, or kernel/user security boundaries.\nC:H - Stale HugeTLB PTE commits can clear hardware Dirty/Accessed bits; this PTE corruption can expose stale file-backed data to other mappers or userfaultfd migration consumers instead of current memory contents.\nI:H - Lost Dirty bits break folio dirty tracking and writeback for HugeTLB mappings, allowing silent loss or corruption of in-memory modifications that should have been persisted or migrated.\nA:N - The race corrupts PTE metadata without causing kernel oops, panic, or hang; availability impact is limited to incorrect page state rather than system crash."
    }
  }
}