CVE-2025-40109 (GCVE-0-2025-40109)
Vulnerability from cvelistv5 – Published: 2025-11-09 04:35 – Updated: 2026-05-11 21:42
VLAI
EPSS
VEX
Title
crypto: rng - Ensure set_ent is always present
Summary
In the Linux kernel, the following vulnerability has been resolved:
crypto: rng - Ensure set_ent is always present
Ensure that set_ent is always set since only drbg provides it.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
77ebdabe8de7c02f43c6de3357f79ff96f9f0579 , < 15d6f42da1bb527629d8e1067b1302d58dec9166
(git)
Affected: 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 , < bd903c25b652c331831226cdf56c8179d18e43f4 (git) Affected: 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 , < 17acbcd44fe8dc17dc1072375e76df2d52da6ac8 (git) Affected: 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 , < ab172f4f42626549b02bada05f09e3f2b0cc26ec (git) Affected: 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 , < c5c703b50e91dd4748769f4c5ab50d9ad60be370 (git) Affected: 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 , < e247a7d138e514a40edda7c4d72c8bd49bb2cad3 (git) Affected: 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 , < 915cb75983bc5e8b80f8a2f25a4af463f7b18c14 (git) Affected: 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 , < c0d36727bf39bb16ef0a67ed608e279535ebf0da (git) |
guessed | |
| Linux | Linux |
Affected:
5.10
Unaffected: 0 , < 5.10 (semver) Unaffected: 5.10.246 , ≤ 5.10.* (semver) Unaffected: 5.15.195 , ≤ 5.15.* (semver) Unaffected: 6.1.156 , ≤ 6.1.* (semver) Unaffected: 6.6.111 , ≤ 6.6.* (semver) Unaffected: 6.12.52 , ≤ 6.12.* (semver) Unaffected: 6.16.12 , ≤ 6.16.* (semver) Unaffected: 6.17.2 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"crypto/rng.c"
],
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"versionType": "git"
},
{
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}
]
},
{
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"product": "Linux",
"programFiles": [
"crypto/rng.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"lessThan": "5.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.246",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.195",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.156",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.111",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.2",
"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": "5.10.246",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.195",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.156",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.111",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
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"versionEndExcluding": "6.12.52",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.12",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17.2",
"versionStartIncluding": "5.10",
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},
{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: rng - Ensure set_ent is always present\n\nEnsure that set_ent is always set since only drbg provides it."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T21:42:45.679Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/15d6f42da1bb527629d8e1067b1302d58dec9166"
},
{
"url": "https://git.kernel.org/stable/c/bd903c25b652c331831226cdf56c8179d18e43f4"
},
{
"url": "https://git.kernel.org/stable/c/17acbcd44fe8dc17dc1072375e76df2d52da6ac8"
},
{
"url": "https://git.kernel.org/stable/c/ab172f4f42626549b02bada05f09e3f2b0cc26ec"
},
{
"url": "https://git.kernel.org/stable/c/c5c703b50e91dd4748769f4c5ab50d9ad60be370"
},
{
"url": "https://git.kernel.org/stable/c/e247a7d138e514a40edda7c4d72c8bd49bb2cad3"
},
{
"url": "https://git.kernel.org/stable/c/915cb75983bc5e8b80f8a2f25a4af463f7b18c14"
},
{
"url": "https://git.kernel.org/stable/c/c0d36727bf39bb16ef0a67ed608e279535ebf0da"
}
],
"title": "crypto: rng - Ensure set_ent is always present",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-40109",
"datePublished": "2025-11-09T04:35:59.979Z",
"dateReserved": "2025-04-16T07:20:57.167Z",
"dateUpdated": "2026-05-11T21:42:45.679Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-40109",
"date": "2026-09-18",
"epss": "0.00209",
"percentile": "0.11454"
},
"microsoft_vex": {
"current_release_date": "2025-11-10T01:03:03.000Z",
"cve": "CVE-2025-40109",
"id": "msrc_CVE-2025-40109",
"initial_release_date": "2025-11-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "crypto: rng - Ensure set_ent is always present",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40109.json",
"version": "1"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"crypto/rng.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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},
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"versionType": "git"
},
{
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"version": "77ebdabe8de7c02f43c6de3357f79ff96f9f0579",
"versionType": "git"
},
{
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},
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"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"crypto/rng.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"lessThan": "5.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.246",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.195",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.156",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.111",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.2",
"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\ncrypto: rng - Ensure set_ent is always present\n\nEnsure that set_ent is always set since only drbg provides it."
}
],
"id": "CVE-2025-40109",
"lastModified": "2026-06-17T09:21:16.753",
"metrics": {},
"published": "2025-11-09T05:15:46.913",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/15d6f42da1bb527629d8e1067b1302d58dec9166"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
{
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},
{
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"url": "https://git.kernel.org/stable/c/bd903c25b652c331831226cdf56c8179d18e43f4"
},
{
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"url": "https://git.kernel.org/stable/c/c0d36727bf39bb16ef0a67ed608e279535ebf0da"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c5c703b50e91dd4748769f4c5ab50d9ad60be370"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e247a7d138e514a40edda7c4d72c8bd49bb2cad3"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T10:27:59+00:00",
"cve": "CVE-2025-40109",
"id": "CVE-2025-40109",
"initial_release_date": "2025-11-09T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Linux kernel: Denial of Service in crypto random number generator due to missing set_ent",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40109.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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