CVE-2025-39823 (GCVE-0-2025-39823)
Vulnerability from cvelistv5 – Published: 2025-09-16 13:00 – Updated: 2026-05-12 12:07
VLAI
EPSS
VEX
Title
KVM: x86: use array_index_nospec with indices that come from guest
Summary
In the Linux kernel, the following vulnerability has been resolved:
KVM: x86: use array_index_nospec with indices that come from guest
min and dest_id are guest-controlled indices. Using array_index_nospec()
after the bounds checks clamps these values to mitigate speculative execution
side-channels.
Severity
7.8 (High)
Assigner
References
11 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4180bf1b655a791a0a6ef93a2ffffc762722c782 , < 72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48
(git)
Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < 31a0ad2f60cb4816e06218b63e695eb72ce74974 (git) Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < d51e381beed5e2f50f85f49f6c90e023754efa12 (git) Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < 33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f (git) Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < f49161646e03d107ce81a99c6ca5da682fe5fb69 (git) Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < 67a05679621b7f721bdba37a5d18665d3aceb695 (git) Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < f57a4bd8d6cb5af05b8ac1be9098e249034639fb (git) Affected: 4180bf1b655a791a0a6ef93a2ffffc762722c782 , < c87bd4dd43a624109c3cc42d843138378a7f4548 (git) |
guessed | |
| Linux | Linux |
Affected:
4.19
Unaffected: 0 , < 4.19 (semver) Unaffected: 5.4.298 , ≤ 5.4.* (semver) Unaffected: 5.10.242 , ≤ 5.10.* (semver) Unaffected: 5.15.191 , ≤ 5.15.* (semver) Unaffected: 6.1.150 , ≤ 6.1.* (semver) Unaffected: 6.6.104 , ≤ 6.6.* (semver) Unaffected: 6.12.45 , ≤ 6.12.* (semver) Unaffected: 6.16.5 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC CN 4100 |
Affected:
0 , < V5.0
(custom)
|
guessed |
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"url": "https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-129"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T01:20:52+00:00",
"cve": "CVE-2025-39823",
"id": "CVE-2025-39823",
"initial_release_date": "2025-09-16T00:00:00+00:00",
"product_status:known_affected": "198",
"product_status:known_not_affected": "76",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: KVM: x86: use array_index_nospec with indices that come from guest",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39823.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-19T02:07:48Z",
"cve": "CVE-2025-39823",
"id": "CVE-2025-39823",
"initial_release_date": "2025-09-16T23:23:54Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "373",
"product_status:known_not_affected": "187",
"product_status:recommended": "749",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-39823",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39823.json",
"version": "46"
}
}
}
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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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