CVE-2025-40218 (GCVE-0-2025-40218)
Vulnerability from cvelistv5 – Published: 2025-12-04 14:50 – Updated: 2026-05-11 21:45
VLAI
EPSS
VEX
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
References
Impacted products
2 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 | |
| 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 |
{
"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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"status": "affected",
"version": "7780d04046a2288ab85d88bedacc60fa4fad9971",
"versionType": "git"
}
]
},
{
"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",
"versionStartIncluding": "6.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17.4",
"versionStartIncluding": "6.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18",
"versionStartIncluding": "6.5",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"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": "2026-05-11T21:45:03.319Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf"
},
{
"url": "https://git.kernel.org/stable/c/ac42320ec873bfe726141069cfdd90ee5bc4e885"
},
{
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"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"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-40218",
"date": "2026-09-20",
"epss": "0.00187",
"percentile": "0.08604"
},
"microsoft_vex": {
"current_release_date": "2025-12-09T01:37:53.000Z",
"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"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"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"
},
{
"lessThan": "b93af2cc8e036754c0d9970d9ddc47f43cc94b9f",
"status": "affected",
"version": "7780d04046a2288ab85d88bedacc60fa4fad9971",
"versionType": "git"
}
]
},
{
"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"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"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."
}
],
"id": "CVE-2025-40218",
"lastModified": "2026-06-17T09:21:28.583",
"metrics": {},
"published": "2025-12-04T15:15:57.643",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0ccd91cf749536d41307a07e60ec14ab0dbf21f5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ac42320ec873bfe726141069cfdd90ee5bc4e885"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b93af2cc8e036754c0d9970d9ddc47f43cc94b9f"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T10:16:19+00:00",
"cve": "CVE-2025-40218",
"id": "CVE-2025-40218",
"initial_release_date": "2025-12-04T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: mm/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",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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