CVE-2025-21766 (GCVE-0-2025-21766)
Vulnerability from cvelistv5 – Published: 2025-02-27 02:18 – Updated: 2026-08-05 11:54
VLAI
EPSS
VEX
Title
ipv4: use RCU protection in __ip_rt_update_pmtu()
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv4: use RCU protection in __ip_rt_update_pmtu()
__ip_rt_update_pmtu() must use RCU protection to make
sure the net structure it reads does not disappear.
Severity
8.1 (High)
Assigner
References
8 references
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
2fbc6e89b2f1403189e624cabaf73e189c5e50c6 , < ce3c6165fce0f06305c806696882a3ad4b90e33f
(git)
Affected: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 , < ea07480b23225942208f1b754fea1e7ec486d37e (git) Affected: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 , < 9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4 (git) Affected: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 , < 4583748b65dee4d61bd50a2214715b4237bc152a (git) Affected: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 , < a39f61d212d822b3062d7f70fa0588e50e55664e (git) Affected: 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 , < 139512191bd06f1b496117c76372b2ce372c9a41 (git) Affected: f415c264176e6095e9dee823e09c5bdd0ee0d337 (git) Affected: 98776a365da509ad923083ae54b38ee521c52742 (git) Affected: 860e2cc78c697c95bc749abb20047239fa1722ea (git) Affected: 2b1be6c925cdf4638811765a9160796291494b89 (git) Affected: 4.14.200 , < 4.15 (semver) Affected: 4.19.148 , < 4.20 (semver) Affected: 5.4.68 , < 5.5 (semver) Affected: 5.8.12 , < 5.9 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.9
Unaffected: 0 , < 5.9 (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 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed |
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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-07-30T10:13:22+00:00",
"cve": "CVE-2025-21766",
"id": "CVE-2025-21766",
"initial_release_date": "2025-02-27T00:00:00+00:00",
"product_status:known_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ipv4: use RCU protection in __ip_rt_update_pmtu()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21766.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-29T01:27:57Z",
"cve": "CVE-2025-21766",
"id": "CVE-2025-21766",
"initial_release_date": "2025-02-28T02:21:10Z",
"product_status:known_affected": "539",
"product_status:known_not_affected": "94",
"product_status:recommended": "584",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-21766",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21766.json",
"version": "64"
}
}
}
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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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