{
  "cveId": "CVE-2026-53108",
  "url": "https://patchblox.com/security/cve/CVE-2026-53108",
  "summary": "CVE-2026-53108 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-53108, released June 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "powerpc/64s: Fix unmap race with PMD migration entries",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  powerpc/64s: Fix unmap race with PMD migration entries  The following race is possible with migration swap entries or device-private THP entries. e.g. when move_pages is called on a PMD THP page, then there maybe an intermediate state, where PMD entry acts as a migration swap entry (pmd_present() is true). Then if an munmap happens at the same time, then this VM_BUG_ON() can happen in pmdp_huge_get_and_clear_full().  This patch fixes that.  Thread A: move_pages() syscall   add_folio_for_migration()     mmap_read_lock(mm)     folio_isolate_lru(folio)     mmap_read_unlock(mm)    do_move_pages_to_node()     migrate_pages()       try_to_migrate_one()         spin_lock(ptl)         set_pmd_migration_entry()           pmdp_invalidate()     # PMD: _PAGE_INVALID | _PAGE_PTE | pfn           set_pmd_at()          # PMD: migration swap entry (pmd_present=0)         spin_unlock(ptl)         [page copy phase]       # \u003C--- RACE WINDOW --\u003E  Thread B: munmap()   mmap_write_downgrade(mm)   unmap_vmas() -\u003E zap_pmd_range()     zap_huge_pmd()       __pmd_trans_huge_lock()         pmd_is_huge():          # !pmd_present \u0026\u0026 !pmd_none -\u003E TRUE (swap entry)         pmd_lock() -\u003E \t\t# spin_lock(ptl), waits for Thread A to release ptl       pmdp_huge_get_and_clear_full()         VM_BUG_ON(!pmd_present(*pmdp))  # HITS!  [  287.738700][ T1867] ------------[ cut here ]------------ [  287.743843][ T1867] kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:187! cpu 0x0: Vector: 700 (Program Check) at [c00000044037f4f0]     pc: c000000000094ca4: pmdp_huge_get_and_clear_full\u002B0x6c/0x23c     lr: c000000000645dec: zap_huge_pmd\u002B0xb0/0x868     sp: c00000044037f790    msr: 800000000282b033   current = 0xc0000004032c1a00   paca    = 0xc000000004fe0000   irqmask: 0x03   irq_happened: 0x09     pid   = 1867, comm = a.out kernel BUG at :187! Linux version 6.19.0-12136-g14360d4f917c-dirty (powerpc64le-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40) #27 SMP PREEMPT Sun Feb 22 10:38:56 IST 2026 enter ? for help [link register   ] c000000000645dec zap_huge_pmd\u002B0xb0/0x868 [c00000044037f790] c00000044037f7d0 (unreliable) [c00000044037f7d0] c000000000645dcc zap_huge_pmd\u002B0x90/0x868 [c00000044037f840] c0000000005724cc unmap_page_range\u002B0x176c/0x1f40 [c00000044037fa00] c000000000572ea0 unmap_vmas\u002B0xb0/0x1d8 [c00000044037fa90] c0000000005af254 unmap_region\u002B0xb4/0x128 [c00000044037fb50] c0000000005af400 vms_complete_munmap_vmas\u002B0x138/0x310 [c00000044037fbe0] c0000000005b0f1c do_vmi_align_munmap\u002B0x1ec/0x238 [c00000044037fd30] c0000000005b3688 __vm_munmap\u002B0x170/0x1f8 [c00000044037fdf0] c000000000587f74 sys_munmap\u002B0x2c/0x40 [c00000044037fe10] c000000000032668 system_call_exception\u002B0x128/0x350 [c00000044037fe50] c00000000000d05c system_call_vectored_common\u002B0x15c/0x2ec ---- Exception: 3000 (System Call Vectored) at 0000000010064a2c SP (7fff9b1ee9c0) is in userspace 0:mon\u003E zh  commit a30b48bf1b24 (\u0022mm/migrate_device: implement THP migration of zone device pages\u0022), enabled migration for device-private PMD entries. Hence this is one other path where this warning could get trigger from.   ------------[ cut here ]------------  WARNING: arch/powerpc/mm/book3s64/hash_pgtable.c:199 at hash__pmd_hugepage_update\u002B0x48/0x284, CPU#3: hmm-tests/1905  Modules linked in: test_hmm  CPU: 3 UID: 0 PID: 1905 Comm: hmm-tests Tainted: G    B   W    L   N  7.0.0-rc1-01438-g7e2f0ee7581c #21 PREEMPT  Tainted: [B]=BAD_PAGE, [W]=WARN, [L]=SOFTLOCKUP, [N]=TEST  Hardware name: IBM pSeries (emulated by qemu) POWER10 (architected) 0x801200 0xf000006 of:SLOF,git-ee03ae pSeries  NIP [c000000000096b70] hash__pmd_hugepage_update\u002B0x48/0x284  LR [c000000000096e7c] hash__pmdp_huge_get_and_clear\u002B0xd0/0xd4  Call Trace:  [c000000604707670] [c000000004e102b8] 0xc000000004e102b8 (unreliable)  [c000000604707700] [c00000000064ec3c] set_pmd_migration_entry\u002B0x414/0x498  [c000000604707760] [c00000000063e5a4] migrate_vma_col ---truncated---",
  "published": "2026-06-24T17:17:25Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0009,
  "epssPercentile": 0.00416,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53108",
  "fixes": [
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      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:22167-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22167-1",
      "released": "2026-11-07T00:47:19Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.40.1",
      "fix": "OPENSUSE-SU-2026:22167-1",
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      "released": "2026-11-07T00:47:19Z"
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    {
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      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.87.3",
      "fix": "SUSE-SU-2026:4935-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4935-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
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      "fix": "SUSE-SU-2026:24446-1",
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      "released": "2026-11-07T00:45:20Z"
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}