CVE-2026-64306 (GCVE-0-2026-64306)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49
VLAI
EPSS
VEX
Title
crypto: drbg - Fix returning success on failure in CTR_DRBG
Summary
In the Linux kernel, the following vulnerability has been resolved:
crypto: drbg - Fix returning success on failure in CTR_DRBG
drbg_ctr_generate() sometimes returns success when it fails, leaving the
output buffer uninitialized. Fix it.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
cde001e4c3c3625c60b68a83eb1f1c2572dee07a , < 074db6db03a0aaa78f05ca9d4838053713796665
(git)
Affected: cde001e4c3c3625c60b68a83eb1f1c2572dee07a , < 7b03312491f9fe6ba4d60c4023e7e61d2d1fed96 (git) Affected: cde001e4c3c3625c60b68a83eb1f1c2572dee07a , < 75597e8774f319152744d24e0683d9393540a951 (git) Affected: cde001e4c3c3625c60b68a83eb1f1c2572dee07a , < cc42fb40171c249bb859071d81b4eb007398a0bc (git) Affected: cde001e4c3c3625c60b68a83eb1f1c2572dee07a , < bbbac12083eff489b35d848332f0dff311131344 (git) Affected: cde001e4c3c3625c60b68a83eb1f1c2572dee07a , < 23b8b188cb32e5531d0f8d3af9506f8959cb369e (git) Affected: cde001e4c3c3625c60b68a83eb1f1c2572dee07a , < a9e886f73dd717027028bb7e3bbca93601ecdfc7 (git) Affected: cde001e4c3c3625c60b68a83eb1f1c2572dee07a , < 39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b (git) Affected: f60b0fa8bbddde66f1d197be07120264b555c84a (git) Affected: 3.12.44 , < 3.13 (semver) |
|
| Linux | Linux |
Affected:
4.1
Unaffected: 0 , < 4.1 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix) |
{
"containers": {
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"programFiles": [
"crypto/drbg.c"
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],
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.1"
},
{
"lessThan": "4.1",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
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"version": "6.18.39",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.2-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
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"versionEndExcluding": "5.10.261",
"versionStartIncluding": "4.1",
"vulnerable": true
},
{
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"versionEndExcluding": "5.15.212",
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},
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},
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},
{
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},
{
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"versionStartIncluding": "3.12.44",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: drbg - Fix returning success on failure in CTR_DRBG\n\ndrbg_ctr_generate() sometimes returns success when it fails, leaving the\noutput buffer uninitialized. Fix it."
}
],
"providerMetadata": {
"dateUpdated": "2026-07-25T08:49:40.153Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/074db6db03a0aaa78f05ca9d4838053713796665"
},
{
"url": "https://git.kernel.org/stable/c/7b03312491f9fe6ba4d60c4023e7e61d2d1fed96"
},
{
"url": "https://git.kernel.org/stable/c/75597e8774f319152744d24e0683d9393540a951"
},
{
"url": "https://git.kernel.org/stable/c/cc42fb40171c249bb859071d81b4eb007398a0bc"
},
{
"url": "https://git.kernel.org/stable/c/bbbac12083eff489b35d848332f0dff311131344"
},
{
"url": "https://git.kernel.org/stable/c/23b8b188cb32e5531d0f8d3af9506f8959cb369e"
},
{
"url": "https://git.kernel.org/stable/c/a9e886f73dd717027028bb7e3bbca93601ecdfc7"
},
{
"url": "https://git.kernel.org/stable/c/39a31ad9e2a5ed7e9c9c6f711dca96c8c8f5f26b"
}
],
"title": "crypto: drbg - Fix returning success on failure in CTR_DRBG",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64306",
"datePublished": "2026-07-25T08:49:40.153Z",
"dateReserved": "2026-07-19T15:36:31.779Z",
"dateUpdated": "2026-07-25T08:49:40.153Z",
"state": "PUBLISHED"
},
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"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-64306",
"date": "2026-07-26",
"epss": "0.00211",
"percentile": "0.11448"
},
"microsoft_vex": {
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"cve": "CVE-2026-64306",
"id": "msrc_CVE-2026-64306",
"initial_release_date": "2026-07-26T01:08:19.000Z",
"product_status:under_investigation": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "crypto: drbg - Fix returning success on failure in CTR_DRBG",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64306.json",
"version": "1"
},
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"suse_vex": {
"aggregate_severity": "not set",
"current_release_date": "2026-07-25T16:46:07Z",
"cve": "CVE-2026-64306",
"id": "CVE-2026-64306",
"initial_release_date": "2026-07-25T16:46:07Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64306",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64306.json",
"version": "2"
}
}
}
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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.
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