CVE-2025-38681 (GCVE-0-2025-38681)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-10-15 01:07
VLAI
Title
mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd()
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd() Memory hot remove unmaps and tears down various kernel page table regions as required. The ptdump code can race with concurrent modifications of the kernel page tables. When leaf entries are modified concurrently, the dump code may log stale or inconsistent information for a VA range, but this is otherwise not harmful. But when intermediate levels of kernel page table are freed, the dump code will continue to use memory that has been freed and potentially reallocated for another purpose. In such cases, the ptdump code may dereference bogus addresses, leading to a number of potential problems. To avoid the above mentioned race condition, platforms such as arm64, riscv and s390 take memory hotplug lock, while dumping kernel page table via the sysfs interface /sys/kernel/debug/kernel_page_tables. Similar race condition exists while checking for pages that might have been marked W+X via /sys/kernel/debug/kernel_page_tables/check_wx_pages which in turn calls ptdump_check_wx(). Instead of solving this race condition again, let's just move the memory hotplug lock inside generic ptdump_check_wx() which will benefit both the scenarios. Drop get_online_mems() and put_online_mems() combination from all existing platform ptdump code paths.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bbd6ec605c0fc286c3f8ce60b4ed44635361d58b , < 3ee9a8c27bfd72c3f465004fa8455785d61be5e8 (git)
Affected: bbd6ec605c0fc286c3f8ce60b4ed44635361d58b , < 69bea84b06b5e779627e7afdbf4b60a7d231c76f (git)
Affected: bbd6ec605c0fc286c3f8ce60b4ed44635361d58b , < ac25ec5fa2bf6e606dc7954488e4dded272fa9cd (git)
Affected: bbd6ec605c0fc286c3f8ce60b4ed44635361d58b , < 1636b5e9c3543b87d673e32a47e7c18698882425 (git)
Affected: bbd6ec605c0fc286c3f8ce60b4ed44635361d58b , < ff40839e018b82c4d756d035f34a63aa2d93be83 (git)
Affected: bbd6ec605c0fc286c3f8ce60b4ed44635361d58b , < 67995d4244694928ce701928e530b5b4adeb17b4 (git)
Affected: bbd6ec605c0fc286c3f8ce60b4ed44635361d58b , < ca8c414499f2e5337a95a76be0d21b728ee31c6b (git)
Affected: bbd6ec605c0fc286c3f8ce60b4ed44635361d58b , < 59305202c67fea50378dcad0cc199dbc13a0e99a (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd()\n\nMemory hot remove unmaps and tears down various kernel page table regions\nas required.  The ptdump code can race with concurrent modifications of\nthe kernel page tables.  When leaf entries are modified concurrently, the\ndump code may log stale or inconsistent information for a VA range, but\nthis is otherwise not harmful.\n\nBut when intermediate levels of kernel page table are freed, the dump code\nwill continue to use memory that has been freed and potentially\nreallocated for another purpose.  In such cases, the ptdump code may\ndereference bogus addresses, leading to a number of potential problems.\n\nTo avoid the above mentioned race condition, platforms such as arm64,\nriscv and s390 take memory hotplug lock, while dumping kernel page table\nvia the sysfs interface /sys/kernel/debug/kernel_page_tables.\n\nSimilar race condition exists while checking for pages that might have\nbeen marked W+X via /sys/kernel/debug/kernel_page_tables/check_wx_pages\nwhich in turn calls ptdump_check_wx().  Instead of solving this race\ncondition again, let\u0027s just move the memory hotplug lock inside generic\nptdump_check_wx() which will benefit both the scenarios.\n\nDrop get_online_mems() and put_online_mems() combination from all existing\nplatform ptdump code paths."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/ptdump: tomar el bloqueo de hotplug de memoria dentro de ptdump_walk_pgd()\n\nLa eliminaci\u00f3n en caliente de memoria desmapea y desmantela varias regiones de la tabla de p\u00e1ginas del kernel seg\u00fan sea necesario. El c\u00f3digo ptdump puede entrar en condici\u00f3n de carrera con modificaciones concurrentes de las tablas de p\u00e1ginas del kernel. Cuando las entradas hoja se modifican concurrentemente, el c\u00f3digo de volcado puede registrar informaci\u00f3n obsoleta o inconsistente para un rango de VA, pero esto no es perjudicial de otra manera.\n\nPero cuando se liberan niveles intermedios de la tabla de p\u00e1ginas del kernel, el c\u00f3digo de volcado continuar\u00e1 usando memoria que ha sido liberada y potencialmente reasignada para otro prop\u00f3sito. En tales casos, el c\u00f3digo ptdump puede desreferenciar direcciones err\u00f3neas, lo que lleva a una serie de problemas potenciales.\n\nPara evitar la condici\u00f3n de carrera mencionada anteriormente, plataformas como arm64, riscv y s390 toman el bloqueo de hotplug de memoria, mientras vuelcan la tabla de p\u00e1ginas del kernel a trav\u00e9s de la interfaz sysfs /sys/kernel/debug/kernel_page_tables.\n\nExiste una condici\u00f3n de carrera similar al verificar p\u00e1ginas que podr\u00edan haber sido marcadas como W+X a trav\u00e9s de /sys/kernel/debug/kernel_page_tables/check_wx_pages, que a su vez llama a ptdump_check_wx(). En lugar de resolver esta condici\u00f3n de carrera de nuevo, simplemente movamos el bloqueo de hotplug de memoria dentro de ptdump_check_wx() gen\u00e9rico, lo que beneficiar\u00e1 a ambos escenarios.\n\nEliminar la combinaci\u00f3n de get_online_mems() y put_online_mems() de todas las rutas de c\u00f3digo ptdump de plataforma existentes."
          }
        ],
        "id": "CVE-2025-38681",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
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              "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"
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              "exploitabilityScore": 1.0,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T01:14:42+00:00",
      "cve": "CVE-2025-38681",
      "id": "CVE-2025-38681",
      "initial_release_date": "2025-09-04T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38681.json",
      "version": "3"
    }
  }
}



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