CVE-2026-53108 (GCVE-0-2026-53108)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30
VLAI
Title
powerpc/64s: Fix unmap race with PMD migration entries
Summary
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] # <--- RACE WINDOW --> Thread B: munmap() mmap_write_downgrade(mm) unmap_vmas() -> zap_pmd_range() zap_huge_pmd() __pmd_trans_huge_lock() pmd_is_huge(): # !pmd_present && !pmd_none -> TRUE (swap entry) pmd_lock() -> # 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+0x6c/0x23c lr: c000000000645dec: zap_huge_pmd+0xb0/0x868 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+0xb0/0x868 [c00000044037f790] c00000044037f7d0 (unreliable) [c00000044037f7d0] c000000000645dcc zap_huge_pmd+0x90/0x868 [c00000044037f840] c0000000005724cc unmap_page_range+0x176c/0x1f40 [c00000044037fa00] c000000000572ea0 unmap_vmas+0xb0/0x1d8 [c00000044037fa90] c0000000005af254 unmap_region+0xb4/0x128 [c00000044037fb50] c0000000005af400 vms_complete_munmap_vmas+0x138/0x310 [c00000044037fbe0] c0000000005b0f1c do_vmi_align_munmap+0x1ec/0x238 [c00000044037fd30] c0000000005b3688 __vm_munmap+0x170/0x1f8 [c00000044037fdf0] c000000000587f74 sys_munmap+0x2c/0x40 [c00000044037fe10] c000000000032668 system_call_exception+0x128/0x350 [c00000044037fe50] c00000000000d05c system_call_vectored_common+0x15c/0x2ec ---- Exception: 3000 (System Call Vectored) at 0000000010064a2c SP (7fff9b1ee9c0) is in userspace 0:mon> zh commit a30b48bf1b24 ("mm/migrate_device: implement THP migration of zone device pages"), 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+0x48/0x284, 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+0x48/0x284 LR [c000000000096e7c] hash__pmdp_huge_get_and_clear+0xd0/0xd4 Call Trace: [c000000604707670] [c000000004e102b8] 0xc000000004e102b8 (unreliable) [c000000604707700] [c00000000064ec3c] set_pmd_migration_entry+0x414/0x498 [c000000604707760] [c00000000063e5a4] migrate_vma_col ---truncated---
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 75358ea359e7c0dfceb3c7b3d854570b4260cb7f , < 829367e55012c053738ebe7db20c4a90d6609ece (git)
Affected: 75358ea359e7c0dfceb3c7b3d854570b4260cb7f , < bbcbf045d6c778e82b47a35fc8728387708e9a3d (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/64s: Fix unmap race with PMD migration entries\n\nThe following race is possible with migration swap entries or\ndevice-private THP entries. e.g. when move_pages is called on a PMD THP\npage, then there maybe an intermediate state, where PMD entry acts as\na migration swap entry (pmd_present() is true). Then if an munmap\nhappens at the same time, then this VM_BUG_ON() can happen in\npmdp_huge_get_and_clear_full().\n\nThis patch fixes that.\n\nThread A: move_pages() syscall\n  add_folio_for_migration()\n    mmap_read_lock(mm)\n    folio_isolate_lru(folio)\n    mmap_read_unlock(mm)\n\n  do_move_pages_to_node()\n    migrate_pages()\n      try_to_migrate_one()\n        spin_lock(ptl)\n        set_pmd_migration_entry()\n          pmdp_invalidate()     # PMD: _PAGE_INVALID | _PAGE_PTE | pfn\n          set_pmd_at()          # PMD: migration swap entry (pmd_present=0)\n        spin_unlock(ptl)\n        [page copy phase]       # \u003c--- RACE WINDOW --\u003e\n\nThread B: munmap()\n  mmap_write_downgrade(mm)\n  unmap_vmas() -\u003e zap_pmd_range()\n    zap_huge_pmd()\n      __pmd_trans_huge_lock()\n        pmd_is_huge():          # !pmd_present \u0026\u0026 !pmd_none -\u003e TRUE (swap entry)\n        pmd_lock() -\u003e \t\t# spin_lock(ptl), waits for Thread A to release ptl\n      pmdp_huge_get_and_clear_full()\n        VM_BUG_ON(!pmd_present(*pmdp))  # HITS!\n\n[  287.738700][ T1867] ------------[ cut here ]------------\n[  287.743843][ T1867] kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:187!\ncpu 0x0: Vector: 700 (Program Check) at [c00000044037f4f0]\n    pc: c000000000094ca4: pmdp_huge_get_and_clear_full+0x6c/0x23c\n    lr: c000000000645dec: zap_huge_pmd+0xb0/0x868\n    sp: c00000044037f790\n   msr: 800000000282b033\n  current = 0xc0000004032c1a00\n  paca    = 0xc000000004fe0000   irqmask: 0x03   irq_happened: 0x09\n    pid   = 1867, comm = a.out\nkernel BUG at :187!\nLinux 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\nenter ? for help\n[link register   ] c000000000645dec zap_huge_pmd+0xb0/0x868\n[c00000044037f790] c00000044037f7d0 (unreliable)\n[c00000044037f7d0] c000000000645dcc zap_huge_pmd+0x90/0x868\n[c00000044037f840] c0000000005724cc unmap_page_range+0x176c/0x1f40\n[c00000044037fa00] c000000000572ea0 unmap_vmas+0xb0/0x1d8\n[c00000044037fa90] c0000000005af254 unmap_region+0xb4/0x128\n[c00000044037fb50] c0000000005af400 vms_complete_munmap_vmas+0x138/0x310\n[c00000044037fbe0] c0000000005b0f1c do_vmi_align_munmap+0x1ec/0x238\n[c00000044037fd30] c0000000005b3688 __vm_munmap+0x170/0x1f8\n[c00000044037fdf0] c000000000587f74 sys_munmap+0x2c/0x40\n[c00000044037fe10] c000000000032668 system_call_exception+0x128/0x350\n[c00000044037fe50] c00000000000d05c system_call_vectored_common+0x15c/0x2ec\n---- Exception: 3000 (System Call Vectored) at 0000000010064a2c\nSP (7fff9b1ee9c0) is in userspace\n0:mon\u003e zh\n\ncommit a30b48bf1b24 (\"mm/migrate_device: implement THP migration of zone device pages\"),\nenabled migration for device-private PMD entries. Hence this is one\nother path where this warning could get trigger from.\n\n ------------[ cut here ]------------\n WARNING: arch/powerpc/mm/book3s64/hash_pgtable.c:199 at hash__pmd_hugepage_update+0x48/0x284, CPU#3: hmm-tests/1905\n Modules linked in: test_hmm\n CPU: 3 UID: 0 PID: 1905 Comm: hmm-tests Tainted: G    B   W    L   N  7.0.0-rc1-01438-g7e2f0ee7581c #21 PREEMPT\n Tainted: [B]=BAD_PAGE, [W]=WARN, [L]=SOFTLOCKUP, [N]=TEST\n Hardware name: IBM pSeries (emulated by qemu) POWER10 (architected) 0x801200 0xf000006 of:SLOF,git-ee03ae pSeries\n NIP [c000000000096b70] hash__pmd_hugepage_update+0x48/0x284\n LR [c000000000096e7c] hash__pmdp_huge_get_and_clear+0xd0/0xd4\n Call Trace:\n [c000000604707670] [c000000004e102b8] 0xc000000004e102b8 (unreliable)\n [c000000604707700] [c00000000064ec3c] set_pmd_migration_entry+0x414/0x498\n [c000000604707760] [c00000000063e5a4] migrate_vma_col\n---truncated---"
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    "cveId": "CVE-2026-53108",
    "datePublished": "2026-06-24T16:30:42.707Z",
    "dateReserved": "2026-06-09T07:44:35.385Z",
    "dateUpdated": "2026-06-24T16:30:42.707Z",
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      "date": "2026-09-22",
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      "cve": "CVE-2026-53108",
      "id": "msrc_CVE-2026-53108",
      "initial_release_date": "2026-06-27T01:17:24.000Z",
      "product_status:known_affected": "3",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "powerpc/64s: Fix unmap race with PMD migration entries",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53108.json",
      "version": "5"
    },
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                  "arch/powerpc/mm/book3s64/pgtable.c"
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        "configurations": [
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                    "versionEndExcluding": "7.0.10",
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/64s: Fix unmap race with PMD migration entries\n\nThe following race is possible with migration swap entries or\ndevice-private THP entries. e.g. when move_pages is called on a PMD THP\npage, then there maybe an intermediate state, where PMD entry acts as\na migration swap entry (pmd_present() is true). Then if an munmap\nhappens at the same time, then this VM_BUG_ON() can happen in\npmdp_huge_get_and_clear_full().\n\nThis patch fixes that.\n\nThread A: move_pages() syscall\n  add_folio_for_migration()\n    mmap_read_lock(mm)\n    folio_isolate_lru(folio)\n    mmap_read_unlock(mm)\n\n  do_move_pages_to_node()\n    migrate_pages()\n      try_to_migrate_one()\n        spin_lock(ptl)\n        set_pmd_migration_entry()\n          pmdp_invalidate()     # PMD: _PAGE_INVALID | _PAGE_PTE | pfn\n          set_pmd_at()          # PMD: migration swap entry (pmd_present=0)\n        spin_unlock(ptl)\n        [page copy phase]       # \u003c--- RACE WINDOW --\u003e\n\nThread B: munmap()\n  mmap_write_downgrade(mm)\n  unmap_vmas() -\u003e zap_pmd_range()\n    zap_huge_pmd()\n      __pmd_trans_huge_lock()\n        pmd_is_huge():          # !pmd_present \u0026\u0026 !pmd_none -\u003e TRUE (swap entry)\n        pmd_lock() -\u003e \t\t# spin_lock(ptl), waits for Thread A to release ptl\n      pmdp_huge_get_and_clear_full()\n        VM_BUG_ON(!pmd_present(*pmdp))  # HITS!\n\n[  287.738700][ T1867] ------------[ cut here ]------------\n[  287.743843][ T1867] kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:187!\ncpu 0x0: Vector: 700 (Program Check) at [c00000044037f4f0]\n    pc: c000000000094ca4: pmdp_huge_get_and_clear_full+0x6c/0x23c\n    lr: c000000000645dec: zap_huge_pmd+0xb0/0x868\n    sp: c00000044037f790\n   msr: 800000000282b033\n  current = 0xc0000004032c1a00\n  paca    = 0xc000000004fe0000   irqmask: 0x03   irq_happened: 0x09\n    pid   = 1867, comm = a.out\nkernel BUG at :187!\nLinux 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\nenter ? for help\n[link register   ] c000000000645dec zap_huge_pmd+0xb0/0x868\n[c00000044037f790] c00000044037f7d0 (unreliable)\n[c00000044037f7d0] c000000000645dcc zap_huge_pmd+0x90/0x868\n[c00000044037f840] c0000000005724cc unmap_page_range+0x176c/0x1f40\n[c00000044037fa00] c000000000572ea0 unmap_vmas+0xb0/0x1d8\n[c00000044037fa90] c0000000005af254 unmap_region+0xb4/0x128\n[c00000044037fb50] c0000000005af400 vms_complete_munmap_vmas+0x138/0x310\n[c00000044037fbe0] c0000000005b0f1c do_vmi_align_munmap+0x1ec/0x238\n[c00000044037fd30] c0000000005b3688 __vm_munmap+0x170/0x1f8\n[c00000044037fdf0] c000000000587f74 sys_munmap+0x2c/0x40\n[c00000044037fe10] c000000000032668 system_call_exception+0x128/0x350\n[c00000044037fe50] c00000000000d05c system_call_vectored_common+0x15c/0x2ec\n---- Exception: 3000 (System Call Vectored) at 0000000010064a2c\nSP (7fff9b1ee9c0) is in userspace\n0:mon\u003e zh\n\ncommit a30b48bf1b24 (\"mm/migrate_device: implement THP migration of zone device pages\"),\nenabled migration for device-private PMD entries. Hence this is one\nother path where this warning could get trigger from.\n\n ------------[ cut here ]------------\n WARNING: arch/powerpc/mm/book3s64/hash_pgtable.c:199 at hash__pmd_hugepage_update+0x48/0x284, CPU#3: hmm-tests/1905\n Modules linked in: test_hmm\n CPU: 3 UID: 0 PID: 1905 Comm: hmm-tests Tainted: G    B   W    L   N  7.0.0-rc1-01438-g7e2f0ee7581c #21 PREEMPT\n Tainted: [B]=BAD_PAGE, [W]=WARN, [L]=SOFTLOCKUP, [N]=TEST\n Hardware name: IBM pSeries (emulated by qemu) POWER10 (architected) 0x801200 0xf000006 of:SLOF,git-ee03ae pSeries\n NIP [c000000000096b70] hash__pmd_hugepage_update+0x48/0x284\n LR [c000000000096e7c] hash__pmdp_huge_get_and_clear+0xd0/0xd4\n Call Trace:\n [c000000604707670] [c000000004e102b8] 0xc000000004e102b8 (unreliable)\n [c000000604707700] [c00000000064ec3c] set_pmd_migration_entry+0x414/0x498\n [c000000604707760] [c00000000063e5a4] migrate_vma_col\n---truncated---"
          }
        ],
        "id": "CVE-2026-53108",
        "lastModified": "2026-07-23T21:30:05.193",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 4.7,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-06-24T17:17:25.107",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/829367e55012c053738ebe7db20c4a90d6609ece"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/bbcbf045d6c778e82b47a35fc8728387708e9a3d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-362"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-23T22:43:26+00:00",
      "cve": "CVE-2026-53108",
      "id": "CVE-2026-53108",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: powerpc/64s: Fix unmap race with PMD migration entries",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53108.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-06-30T01:43:42Z",
      "cve": "CVE-2026-53108",
      "id": "CVE-2026-53108",
      "initial_release_date": "2026-06-30T01:43:42Z",
      "product_status:known_affected": "200",
      "product_status:known_not_affected": "91",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53108",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53108.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.