CVE-2025-40021 (GCVE-0-2025-40021)
Vulnerability from cvelistv5 – Published: 2025-10-24 12:24 – Updated: 2026-05-11 21:40
VLAI
EPSS
VEX
Title
tracing: dynevent: Add a missing lockdown check on dynevent
Summary
In the Linux kernel, the following vulnerability has been resolved:
tracing: dynevent: Add a missing lockdown check on dynevent
Since dynamic_events interface on tracefs is compatible with
kprobe_events and uprobe_events, it should also check the lockdown
status and reject if it is set.
Severity
No CVSS data available.
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
17911ff38aa58d3c95c07589dbf5d3564c4cf3c5 , < f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf
(git)
Affected: 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5 , < 0d41604d2d53c1abe27fefb54b37a8f6642a4d74 (git) Affected: 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5 , < 07b1f63b5f86765793fab44d3d4c2be681cddafb (git) Affected: 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5 , < 3887f3814c0e770e6b73567fe0f83a2c01a6470c (git) Affected: 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5 , < 573b1e39edfcb7b4eecde0f1664455a1f4462eee (git) Affected: 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5 , < b47c4e06687a5a7b6c6ef4bd303fcfe4430b26bb (git) Affected: 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5 , < 456c32e3c4316654f95f9d49c12cbecfb77d5660 (git) |
guessed | |
| Linux | Linux |
Affected:
5.4
Unaffected: 0 , < 5.4 (semver) Unaffected: 5.10.245 , ≤ 5.10.* (semver) Unaffected: 5.15.194 , ≤ 5.15.* (semver) Unaffected: 6.1.155 , ≤ 6.1.* (semver) Unaffected: 6.6.109 , ≤ 6.6.* (semver) Unaffected: 6.12.50 , ≤ 6.12.* (semver) Unaffected: 6.16.10 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/trace/trace_dynevent.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf",
"status": "affected",
"version": "17911ff38aa58d3c95c07589dbf5d3564c4cf3c5",
"versionType": "git"
},
{
"lessThan": "0d41604d2d53c1abe27fefb54b37a8f6642a4d74",
"status": "affected",
"version": "17911ff38aa58d3c95c07589dbf5d3564c4cf3c5",
"versionType": "git"
},
{
"lessThan": "07b1f63b5f86765793fab44d3d4c2be681cddafb",
"status": "affected",
"version": "17911ff38aa58d3c95c07589dbf5d3564c4cf3c5",
"versionType": "git"
},
{
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"status": "affected",
"version": "17911ff38aa58d3c95c07589dbf5d3564c4cf3c5",
"versionType": "git"
},
{
"lessThan": "573b1e39edfcb7b4eecde0f1664455a1f4462eee",
"status": "affected",
"version": "17911ff38aa58d3c95c07589dbf5d3564c4cf3c5",
"versionType": "git"
},
{
"lessThan": "b47c4e06687a5a7b6c6ef4bd303fcfe4430b26bb",
"status": "affected",
"version": "17911ff38aa58d3c95c07589dbf5d3564c4cf3c5",
"versionType": "git"
},
{
"lessThan": "456c32e3c4316654f95f9d49c12cbecfb77d5660",
"status": "affected",
"version": "17911ff38aa58d3c95c07589dbf5d3564c4cf3c5",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/trace/trace_dynevent.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.4"
},
{
"lessThan": "5.4",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.245",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.194",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.155",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.109",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.245",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.194",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
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"versionEndExcluding": "6.1.155",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.109",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.50",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.10",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17",
"versionStartIncluding": "5.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: dynevent: Add a missing lockdown check on dynevent\n\nSince dynamic_events interface on tracefs is compatible with\nkprobe_events and uprobe_events, it should also check the lockdown\nstatus and reject if it is set."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T21:40:56.795Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf"
},
{
"url": "https://git.kernel.org/stable/c/0d41604d2d53c1abe27fefb54b37a8f6642a4d74"
},
{
"url": "https://git.kernel.org/stable/c/07b1f63b5f86765793fab44d3d4c2be681cddafb"
},
{
"url": "https://git.kernel.org/stable/c/3887f3814c0e770e6b73567fe0f83a2c01a6470c"
},
{
"url": "https://git.kernel.org/stable/c/573b1e39edfcb7b4eecde0f1664455a1f4462eee"
},
{
"url": "https://git.kernel.org/stable/c/b47c4e06687a5a7b6c6ef4bd303fcfe4430b26bb"
},
{
"url": "https://git.kernel.org/stable/c/456c32e3c4316654f95f9d49c12cbecfb77d5660"
}
],
"title": "tracing: dynevent: Add a missing lockdown check on dynevent",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-40021",
"datePublished": "2025-10-24T12:24:57.107Z",
"dateReserved": "2025-04-16T07:20:57.152Z",
"dateUpdated": "2026-05-11T21:40:56.795Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-40021",
"date": "2026-09-17",
"epss": "0.00193",
"percentile": "0.09182"
},
"microsoft_vex": {
"current_release_date": "2025-10-26T01:01:36.000Z",
"cve": "CVE-2025-40021",
"id": "msrc_CVE-2025-40021",
"initial_release_date": "2025-10-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "tracing: dynevent: Add a missing lockdown check on dynevent",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40021.json",
"version": "1"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2025-40021\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-24T13:15:47.263\",\"lastModified\":\"2026-06-17T09:21:08.063\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing: dynevent: Add a missing lockdown check on dynevent\\n\\nSince dynamic_events interface on tracefs is compatible with\\nkprobe_events and uprobe_events, it should also check the lockdown\\nstatus and reject if it is set.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/trace/trace_dynevent.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"17911ff38aa58d3c95c07589dbf5d3564c4cf3c5\",\"lessThan\":\"f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"17911ff38aa58d3c95c07589dbf5d3564c4cf3c5\",\"lessThan\":\"0d41604d2d53c1abe27fefb54b37a8f6642a4d74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"17911ff38aa58d3c95c07589dbf5d3564c4cf3c5\",\"lessThan\":\"07b1f63b5f86765793fab44d3d4c2be681cddafb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"17911ff38aa58d3c95c07589dbf5d3564c4cf3c5\",\"lessThan\":\"3887f3814c0e770e6b73567fe0f83a2c01a6470c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"17911ff38aa58d3c95c07589dbf5d3564c4cf3c5\",\"lessThan\":\"573b1e39edfcb7b4eecde0f1664455a1f4462eee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"17911ff38aa58d3c95c07589dbf5d3564c4cf3c5\",\"lessThan\":\"b47c4e06687a5a7b6c6ef4bd303fcfe4430b26bb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"17911ff38aa58d3c95c07589dbf5d3564c4cf3c5\",\"lessThan\":\"456c32e3c4316654f95f9d49c12cbecfb77d5660\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/trace/trace_dynevent.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.245\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.194\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.155\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.109\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.50\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.10\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/07b1f63b5f86765793fab44d3d4c2be681cddafb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0d41604d2d53c1abe27fefb54b37a8f6642a4d74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3887f3814c0e770e6b73567fe0f83a2c01a6470c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/456c32e3c4316654f95f9d49c12cbecfb77d5660\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/573b1e39edfcb7b4eecde0f1664455a1f4462eee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b47c4e06687a5a7b6c6ef4bd303fcfe4430b26bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-30T10:27:47+00:00",
"cve": "CVE-2025-40021",
"id": "CVE-2025-40021",
"initial_release_date": "2025-10-24T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: tracing: dynevent: Add a missing lockdown check on dynevent",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40021.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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