github - ghsa-349m-qg9r-c9hf

GHSA-349M-QG9R-C9HF

Vulnerability from github – Published: 2025-12-04 15:30 – Updated: 2025-12-04 15:30

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40218"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-04T15:15:57Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-349m-qg9r-c9hf",
  "modified": "2025-12-04T15:30:33Z",
  "published": "2025-12-04T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40218"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ccd91cf749536d41307a07e60ec14ab0dbf21f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac42320ec873bfe726141069cfdd90ee5bc4e885"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b93af2cc8e036754c0d9970d9ddc47f43cc94b9f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2025-12-04 14:50 – Updated: 2025-12-04 14:50

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

References

URL

Tags

	https://git.kernel.org/stable/c/677ebfe5d00f94ade…
	https://git.kernel.org/stable/c/ac42320ec873bfe72…
	https://git.kernel.org/stable/c/0ccd91cf749536d41…
	https://git.kernel.org/stable/c/b93af2cc8e036754c…

Impacted products

Vendor

Product

Version

Linux

Affected: 7780d04046a2288ab85d88bedacc60fa4fad9971 , < 677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf (git)
Affected: 7780d04046a2288ab85d88bedacc60fa4fad9971 , < ac42320ec873bfe726141069cfdd90ee5bc4e885 (git)
Affected: 7780d04046a2288ab85d88bedacc60fa4fad9971 , < 0ccd91cf749536d41307a07e60ec14ab0dbf21f5 (git)
Affected: 7780d04046a2288ab85d88bedacc60fa4fad9971 , < b93af2cc8e036754c0d9970d9ddc47f43cc94b9f (git)

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)

Show details on NVD website

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/vaddr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf",
              "status": "affected",
              "version": "7780d04046a2288ab85d88bedacc60fa4fad9971",
              "versionType": "git"
            },
            {
              "lessThan": "ac42320ec873bfe726141069cfdd90ee5bc4e885",
              "status": "affected",
              "version": "7780d04046a2288ab85d88bedacc60fa4fad9971",
              "versionType": "git"
            },
            {
              "lessThan": "0ccd91cf749536d41307a07e60ec14ab0dbf21f5",
              "status": "affected",
              "version": "7780d04046a2288ab85d88bedacc60fa4fad9971",
              "versionType": "git"
            },
            {
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              "version": "7780d04046a2288ab85d88bedacc60fa4fad9971",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/vaddr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "lessThan": "6.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.113",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.54",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                  "versionEndExcluding": "6.18",
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                }
              ],
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              "operator": "OR"
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      "descriptions": [
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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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-04T14:50:41.873Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf"
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          "url": "https://git.kernel.org/stable/c/ac42320ec873bfe726141069cfdd90ee5bc4e885"
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        {
          "url": "https://git.kernel.org/stable/c/0ccd91cf749536d41307a07e60ec14ab0dbf21f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/b93af2cc8e036754c0d9970d9ddc47f43cc94b9f"
        }
      ],
      "title": "mm/damon/vaddr: do not repeat pte_offset_map_lock() until success",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40218",
    "datePublished": "2025-12-04T14:50:41.873Z",
    "dateReserved": "2025-04-16T07:20:57.179Z",
    "dateUpdated": "2025-12-04T14:50:41.873Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-349M-QG9R-C9HF

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

Tags

Sightings

Nomenclature