CVE-2025-40218 (GCVE-0-2025-40218)
Vulnerability from cvelistv5
Published
2025-12-04 14:50
Modified
2025-12-04 14:50
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
{
"containers": {
"cna": {
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{
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"product": "Linux",
"programFiles": [
"mm/damon/vaddr.c"
],
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"vendor": "Linux",
"versions": [
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{
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"programFiles": [
"mm/damon/vaddr.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "6.5"
},
{
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"version": "0",
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{
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"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": "*",
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"version": "6.18",
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}
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"cpeApplicability": [
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"descriptions": [
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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": "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"
},
{
"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",
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"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",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-40218\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-04T15:15:57.643\",\"lastModified\":\"2025-12-04T17:15:08.283\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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