CVE-2025-40218 (GCVE-0-2025-40218)

Vulnerability from cvelistv5 – Published: 2025-12-04 14:50 – Updated: 2026-05-11 21:45
VLAI
Title
mm/damon/vaddr: do not repeat pte_offset_map_lock() until success
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/damon/vaddr: do not repeat pte_offset_map_lock() until success DAMON's virtual address space operation set implementation (vaddr) calls pte_offset_map_lock() inside the page table walk callback function. This is for reading and writing page table accessed bits. If pte_offset_map_lock() fails, it retries by returning the page table walk callback function with ACTION_AGAIN. pte_offset_map_lock() can continuously fail if the target is a pmd migration entry, though. Hence it could cause an infinite page table walk if the migration cannot be done until the page table walk is finished. This indeed caused a soft lockup when CPU hotplugging and DAMON were running in parallel. Avoid the infinite loop by simply not retrying the page table walk. DAMON is promising only a best-effort accuracy, so missing access to such pages is no problem.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7780d04046a2288ab85d88bedacc60fa4fad9971 , < 677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf (git)
Affected: 7780d04046a2288ab85d88bedacc60fa4fad9971 , < ac42320ec873bfe726141069cfdd90ee5bc4e885 (git)
Affected: 7780d04046a2288ab85d88bedacc60fa4fad9971 , < 0ccd91cf749536d41307a07e60ec14ab0dbf21f5 (git)
Affected: 7780d04046a2288ab85d88bedacc60fa4fad9971 , < b93af2cc8e036754c0d9970d9ddc47f43cc94b9f (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.113 , ≤ 6.6.* (semver)
Unaffected: 6.12.54 , ≤ 6.12.* (semver)
Unaffected: 6.17.4 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/vaddr.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/vaddr: do not repeat pte_offset_map_lock() until success\n\nDAMON\u0027s virtual address space operation set implementation (vaddr) calls\npte_offset_map_lock() inside the page table walk callback function.  This\nis for reading and writing page table accessed bits.  If\npte_offset_map_lock() fails, it retries by returning the page table walk\ncallback function with ACTION_AGAIN.\n\npte_offset_map_lock() can continuously fail if the target is a pmd\nmigration entry, though.  Hence it could cause an infinite page table walk\nif the migration cannot be done until the page table walk is finished. \nThis indeed caused a soft lockup when CPU hotplugging and DAMON were\nrunning in parallel.\n\nAvoid the infinite loop by simply not retrying the page table walk.  DAMON\nis promising only a best-effort accuracy, so missing access to such pages\nis no problem."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:45:03.319Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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      "title": "mm/damon/vaddr: do not repeat pte_offset_map_lock() until success",
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    "cveId": "CVE-2025-40218",
    "datePublished": "2025-12-04T14:50:41.873Z",
    "dateReserved": "2025-04-16T07:20:57.179Z",
    "dateUpdated": "2026-05-11T21:45:03.319Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-11-04",
      "epss": "0.00201",
      "percentile": "0.10066"
    },
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      "cve": "CVE-2025-40218",
      "id": "msrc_CVE-2025-40218",
      "initial_release_date": "2025-12-02T00:00:00.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "mm/damon/vaddr: do not repeat pte_offset_map_lock() until success",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40218.json",
      "version": "3"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/vaddr: do not repeat pte_offset_map_lock() until success\n\nDAMON\u0027s virtual address space operation set implementation (vaddr) calls\npte_offset_map_lock() inside the page table walk callback function.  This\nis for reading and writing page table accessed bits.  If\npte_offset_map_lock() fails, it retries by returning the page table walk\ncallback function with ACTION_AGAIN.\n\npte_offset_map_lock() can continuously fail if the target is a pmd\nmigration entry, though.  Hence it could cause an infinite page table walk\nif the migration cannot be done until the page table walk is finished. \nThis indeed caused a soft lockup when CPU hotplugging and DAMON were\nrunning in parallel.\n\nAvoid the infinite loop by simply not retrying the page table walk.  DAMON\nis promising only a best-effort accuracy, so missing access to such pages\nis no problem."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/damon/vaddr: no repetir pte_offset_map_lock() hasta el \u00e9xito\n\nLa implementaci\u00f3n del conjunto de operaciones del espacio de direcciones virtuales de DAMON (vaddr) llama a pte_offset_map_lock() dentro de la funci\u00f3n de *callback* de recorrido de la tabla de p\u00e1ginas. Esto es para leer y escribir bits de acceso de la tabla de p\u00e1ginas. Si pte_offset_map_lock() falla, reintenta devolviendo la funci\u00f3n de *callback* de recorrido de la tabla de p\u00e1ginas con ACTION_AGAIN.\n\npte_offset_map_lock() puede fallar continuamente, sin embargo, si el objetivo es una entrada de migraci\u00f3n pmd. Por lo tanto, podr\u00eda causar un recorrido infinito de la tabla de p\u00e1ginas si la migraci\u00f3n no se puede realizar hasta que el recorrido de la tabla de p\u00e1ginas haya terminado. Esto de hecho caus\u00f3 un *soft lockup* cuando el *hotplugging* de CPU y DAMON se ejecutaban en paralelo.\n\nEvite el bucle infinito simplemente no reintentando el recorrido de la tabla de p\u00e1ginas. DAMON solo promete una precisi\u00f3n de \u201cmejor esfuerzo\u201d, por lo que la falta de acceso a dichas p\u00e1ginas no es un problema."
          }
        ],
        "id": "CVE-2025-40218",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-12-04T15:15:57.643",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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      "current_release_date": "2026-06-30T10:16:19+00:00",
      "cve": "CVE-2025-40218",
      "id": "CVE-2025-40218",
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      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/damon/vaddr: do not repeat pte_offset_map_lock() until success",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40218.json",
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}



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