CVE-2025-68313 (GCVE-0-2025-68313)
Vulnerability from cvelistv5 – Published: 2025-12-16 15:39 – Updated: 2026-09-02 12:49
VLAI
EPSS
VEX
Title
x86/CPU/AMD: Add RDSEED fix for Zen5
Summary
In the Linux kernel, the following vulnerability has been resolved:
x86/CPU/AMD: Add RDSEED fix for Zen5
There's an issue with RDSEED's 16-bit and 32-bit register output
variants on Zen5 which return a random value of 0 "at a rate inconsistent
with randomness while incorrectly signaling success (CF=1)". Search the
web for AMD-SB-7055 for more detail.
Add a fix glue which checks microcode revisions.
[ bp: Add microcode revisions checking, rewrite. ]
Severity
7.1 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
3e4147f33f8b647775357bae0248b9a2aeebfcd2 , < e980de2ff109dacb6d9d3a77f01b27c467115ecb
(git)
Affected: 3e4147f33f8b647775357bae0248b9a2aeebfcd2 , < 36ff93e66d0efc46e39fab536a9feec968daa766 (git) Affected: 3e4147f33f8b647775357bae0248b9a2aeebfcd2 , < 607b9fb2ce248cc5b633c5949e0153838992c152 (git) Affected: 5953e7a89966fc5a42124a08ba33a9c57ba5173c (git) Affected: 6.6.156 , < 6.7 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.8
Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.58 , ≤ 6.12.* (semver) Unaffected: 6.17.8 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"arch/x86/kernel/cpu/amd.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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"versionType": "git"
},
{
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"status": "affected",
"version": "3e4147f33f8b647775357bae0248b9a2aeebfcd2",
"versionType": "git"
},
{
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"status": "affected",
"version": "3e4147f33f8b647775357bae0248b9a2aeebfcd2",
"versionType": "git"
},
{
"status": "affected",
"version": "5953e7a89966fc5a42124a08ba33a9c57ba5173c",
"versionType": "git"
},
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"versionType": "semver"
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"vendor": "Linux",
"versions": [
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"version": "6.8"
},
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"version": "0",
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"status": "unaffected",
"version": "6.12.58",
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"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
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"nodes": [
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"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.58",
"versionStartIncluding": "6.8",
"vulnerable": true
},
{
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"versionStartIncluding": "6.8",
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},
{
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"versionStartIncluding": "6.8",
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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\nx86/CPU/AMD: Add RDSEED fix for Zen5\n\nThere\u0027s an issue with RDSEED\u0027s 16-bit and 32-bit register output\nvariants on Zen5 which return a random value of 0 \"at a rate inconsistent\nwith randomness while incorrectly signaling success (CF=1)\". Search the\nweb for AMD-SB-7055 for more detail.\n\nAdd a fix glue which checks microcode revisions.\n\n [ bp: Add microcode revisions checking, rewrite. ]"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The affected RDSEED forms are directly executable by local user-space code; no syscall or network packet directly reaches the primitive.\nAC:L - An attacker can create the demonstrated RDSEED and memory-pressure workload using concurrent threads, so the triggering conditions are attacker-controlled.\nPR:L - An ordinary unprivileged process can execute RDSEED and induce contention without capabilities, root access, or namespace privileges.\nUI:N - Exploitation requires no action by a human victim once affected software consumes RDSEED-derived entropy.\nS:U - The impact remains within the affected host or guest security authority, with no demonstrated guest-to-host escape or other scope crossing.\nC:H - Predictable seed material can compromise cryptographic private keys, session keys, or nonces, potentially exposing all data protected by them.\nI:H - Compromised signing, authentication, or encryption keys can enable impersonation, forgery, and unauthorized modification of protected data.\nA:N - The flaw degrades entropy but does not directly corrupt memory, crash the kernel, hang execution, or exhaust resources."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-02T12:49:29.117Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e980de2ff109dacb6d9d3a77f01b27c467115ecb"
},
{
"url": "https://git.kernel.org/stable/c/36ff93e66d0efc46e39fab536a9feec968daa766"
},
{
"url": "https://git.kernel.org/stable/c/607b9fb2ce248cc5b633c5949e0153838992c152"
}
],
"title": "x86/CPU/AMD: Add RDSEED fix for Zen5",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-68313",
"datePublished": "2025-12-16T15:39:43.972Z",
"dateReserved": "2025-12-16T14:48:05.295Z",
"dateUpdated": "2026-09-02T12:49:29.117Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-68313",
"date": "2026-09-26",
"epss": "0.00139",
"percentile": "0.02693"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/x86/kernel/cpu/amd.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "3e4147f33f8b647775357bae0248b9a2aeebfcd2",
"versionType": "git"
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{
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"status": "affected",
"version": "3e4147f33f8b647775357bae0248b9a2aeebfcd2",
"versionType": "git"
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{
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"versionType": "git"
},
{
"status": "affected",
"version": "5953e7a89966fc5a42124a08ba33a9c57ba5173c",
"versionType": "git"
},
{
"lessThan": "6.7",
"status": "affected",
"version": "6.6.156",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/x86/kernel/cpu/amd.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.8"
},
{
"lessThan": "6.8",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.58",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.8",
"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\nx86/CPU/AMD: Add RDSEED fix for Zen5\n\nThere\u0027s an issue with RDSEED\u0027s 16-bit and 32-bit register output\nvariants on Zen5 which return a random value of 0 \"at a rate inconsistent\nwith randomness while incorrectly signaling success (CF=1)\". Search the\nweb for AMD-SB-7055 for more detail.\n\nAdd a fix glue which checks microcode revisions.\n\n [ bp: Add microcode revisions checking, rewrite. ]"
}
],
"id": "CVE-2025-68313",
"lastModified": "2026-09-02T13:17:01.690",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.2,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2025-12-16T16:16:10.883",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/36ff93e66d0efc46e39fab536a9feec968daa766"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/607b9fb2ce248cc5b633c5949e0153838992c152"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e980de2ff109dacb6d9d3a77f01b27c467115ecb"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-30T08:34:20+00:00",
"cve": "CVE-2025-68313",
"id": "CVE-2025-68313",
"initial_release_date": "2025-12-16T00:00:00+00:00",
"product_status:known_affected": "260",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Linux kernel: Denial of Service due to inconsistent random number generation on AMD Zen5 processors",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68313.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-12T16:44:45Z",
"cve": "CVE-2025-68313",
"id": "CVE-2025-68313",
"initial_release_date": "2025-12-17T00:23:51Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "394",
"product_status:known_not_affected": "460",
"product_status:recommended": "384",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-68313",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68313.json",
"version": "37"
}
}
}
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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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