CVE-2025-21639 (GCVE-0-2025-21639)
Vulnerability from cvelistv5 – Published: 2025-01-19 10:17 – Updated: 2026-05-12 12:03
VLAI
EPSS
VEX
Title
sctp: sysctl: rto_min/max: avoid using current->nsproxy
Summary
In the Linux kernel, the following vulnerability has been resolved:
sctp: sysctl: rto_min/max: avoid using current->nsproxy
As mentioned in a previous commit of this series, using the 'net'
structure via 'current' is not recommended for different reasons:
- Inconsistency: getting info from the reader's/writer's netns vs only
from the opener's netns.
- current->nsproxy can be NULL in some cases, resulting in an 'Oops'
(null-ptr-deref), e.g. when the current task is exiting, as spotted by
syzbot [1] using acct(2).
The 'net' structure can be obtained from the table->data using
container_of().
Note that table->data could also be used directly, as this is the only
member needed from the 'net' structure, but that would increase the size
of this fix, to use '*data' everywhere 'net->sctp.rto_min/max' is used.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:54 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
10 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 , < c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9
(git)
Affected: 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 , < 246428bfb9e7db15c5cd08e1d0eca41b65af2b06 (git) Affected: 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 , < 0f78f09466744589e420935e646ae78212a38290 (git) Affected: 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 , < 4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482 (git) Affected: 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 , < dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f (git) Affected: 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 , < c87f1f6ade56c711f8736901e330685b453e420e (git) Affected: 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 , < 9fc17b76fc70763780aa78b38fcf4742384044a5 (git) |
guessed | |
| Linux | Linux |
Affected:
3.13
Unaffected: 0 , < 3.13 (semver) Unaffected: 5.4.290 , ≤ 5.4.* (semver) Unaffected: 5.10.234 , ≤ 5.10.* (semver) Unaffected: 5.15.177 , ≤ 5.15.* (semver) Unaffected: 6.1.125 , ≤ 6.1.* (semver) Unaffected: 6.6.72 , ≤ 6.6.* (semver) Unaffected: 6.12.10 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed |
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: sysctl: rto_min/max: evitar usar current-\u0026gt;nsproxy Como se mencion\u00f3 en un commit anterior de esta serie, no se recomienda usar la estructura \u0027net\u0027 a trav\u00e9s de \u0027current\u0027 por diferentes razones: - Inconsistencia: obtener informaci\u00f3n de los netns del lector/escritor vs solo de los netns del abridor. - current-\u0026gt;nsproxy puede ser NULL en algunos casos, lo que resulta en un \u0027Oops\u0027 (null-ptr-deref), por ejemplo cuando la tarea actual est\u00e1 saliendo, como lo detect\u00f3 syzbot [1] usando acct(2). La estructura \u0027net\u0027 se puede obtener de table-\u0026gt;data usando Container_of(). Tenga en cuenta que table-\u0026gt;data tambi\u00e9n se puede usar directamente, ya que este es el \u00fanico miembro necesario de la estructura \u0027net\u0027, pero eso aumentar\u00eda el tama\u00f1o de esta correcci\u00f3n, para usar \u0027*data\u0027 en todos los lugares donde se usa \u0027net-\u0026gt;sctp.rto_min/max\u0027."
}
],
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"scope": "UNCHANGED",
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},
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},
{
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
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"description": [
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"lang": "en",
"value": "CWE-476"
}
],
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"type": "Primary"
},
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"value": "CWE-476"
}
],
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"type": "Secondary"
}
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"current_release_date": "2025-11-21T10:46:37+00:00",
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"id": "CVE-2025-21639",
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"product_status:known_affected": "276",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: sctp: sysctl: rto_min/max: avoid using current-\u003ensproxy",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21639.json",
"version": "3"
},
"vulnrichment": {
"containers": {
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{
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"dateUpdated": "2025-11-03T20:58:20.727Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
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},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
}
],
"title": "CVE Program Container"
},
{
"affected": [
{
"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
"vendor": "Siemens",
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"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
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}
],
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{
"metrics": [
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"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
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"integrityImpact": "NONE",
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"version": "3.1"
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},
{
"Automatable": "no"
},
{
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}
],
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"timestamp": "2025-10-01T19:54:07.301315Z",
"version": "2.0.3"
},
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"cweId": "CWE-476",
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},
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{
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},
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: rto_min/max: avoid using current-\u003ensproxy\n\nAs mentioned in a previous commit of this series, using the \u0027net\u0027\nstructure via \u0027current\u0027 is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader\u0027s/writer\u0027s netns vs only\n from the opener\u0027s netns.\n\n- current-\u003ensproxy can be NULL in some cases, resulting in an \u0027Oops\u0027\n (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n syzbot [1] using acct(2).\n\nThe \u0027net\u0027 structure can be obtained from the table-\u003edata using\ncontainer_of().\n\nNote that table-\u003edata could also be used directly, as this is the only\nmember needed from the \u0027net\u0027 structure, but that would increase the size\nof this fix, to use \u0027*data\u0027 everywhere \u0027net-\u003esctp.rto_min/max\u0027 is used."
}
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{
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}
}
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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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