CVE-2025-21765 (GCVE-0-2025-21765)
Vulnerability from cvelistv5 – Published: 2025-02-27 02:18 – Updated: 2026-09-08 08:40
VLAI
EPSS
VEX
Title
ipv6: use RCU protection in ip6_default_advmss()
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv6: use RCU protection in ip6_default_advmss()
ip6_default_advmss() needs rcu protection to make
sure the net structure it reads does not disappear.
Severity
8.1 (High)
Assigner
References
13 references
Impacted products
9 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
5578689a4e3c04f2d43ea39736fd3fa396d80c6e , < 78ad057472d8c76e0602402269222f9f9c698790
(git)
Affected: 5578689a4e3c04f2d43ea39736fd3fa396d80c6e , < d02f30d220ef9511568a48dba8a9004c65f8d904 (git) Affected: 5578689a4e3c04f2d43ea39736fd3fa396d80c6e , < 28de355b63ad42309ed5a03ee7c436c90512265b (git) Affected: 5578689a4e3c04f2d43ea39736fd3fa396d80c6e , < 84212387caadb211cd9dadd6fd5563bd37dc1f5e (git) Affected: 5578689a4e3c04f2d43ea39736fd3fa396d80c6e , < 4176a68b0db8fc74ac14fcd00ba8231371051dc2 (git) Affected: 5578689a4e3c04f2d43ea39736fd3fa396d80c6e , < 713a40c892f40300d63691d9f85b2a23b48fe1e8 (git) Affected: 5578689a4e3c04f2d43ea39736fd3fa396d80c6e , < 550ed693f47370502a71b85382e7f9e6417300b8 (git) Affected: 5578689a4e3c04f2d43ea39736fd3fa396d80c6e , < 3c8ffcd248da34fc41e52a46e51505900115fc2a (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.26
Unaffected: 0 , < 2.6.26 (semver) Unaffected: 5.4.291 , ≤ 5.4.* (semver) Unaffected: 5.10.235 , ≤ 5.10.* (semver) Unaffected: 5.15.179 , ≤ 5.15.* (semver) Unaffected: 6.1.129 , ≤ 6.1.* (semver) Unaffected: 6.6.79 , ≤ 6.6.* (semver) Unaffected: 6.12.16 , ≤ 6.12.* (semver) Unaffected: 6.13.4 , ≤ 6.13.* (semver) Unaffected: 6.14 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed |
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
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"title": "ipv6: use RCU protection in ip6_default_advmss()",
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"datePublished": "2025-02-27T02:18:16.078Z",
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"date": "2026-09-15",
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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-30T09:39:09+00:00",
"cve": "CVE-2025-21765",
"id": "CVE-2025-21765",
"initial_release_date": "2025-02-27T00:00:00+00:00",
"product_status:fixed": "612",
"product_status:known_affected": "112",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ipv6: use RCU protection in ip6_default_advmss()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21765.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-02T12:35:58Z",
"cve": "CVE-2025-21765",
"id": "CVE-2025-21765",
"initial_release_date": "2025-02-28T02:21:11Z",
"product_status:known_affected": "633",
"product_status:recommended": "667",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-21765",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21765.json",
"version": "62"
}
}
}
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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.
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.
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