CVE-2025-38465 (GCVE-0-2025-38465)
Vulnerability from cvelistv5 – Published: 2025-07-25 15:27 – Updated: 2026-07-14 12:42
VLAI
EPSS
VEX
Title
netlink: Fix wraparounds of sk->sk_rmem_alloc.
Summary
In the Linux kernel, the following vulnerability has been resolved:
netlink: Fix wraparounds of sk->sk_rmem_alloc.
Netlink has this pattern in some places
if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
atomic_add(skb->truesize, &sk->sk_rmem_alloc);
, which has the same problem fixed by commit 5a465a0da13e ("udp:
Fix multiple wraparounds of sk->sk_rmem_alloc.").
For example, if we set INT_MAX to SO_RCVBUFFORCE, the condition
is always false as the two operands are of int.
Then, a single socket can eat as many skb as possible until OOM
happens, and we can see multiple wraparounds of sk->sk_rmem_alloc.
Let's fix it by using atomic_add_return() and comparing the two
variables as unsigned int.
Before:
[root@fedora ~]# ss -f netlink
Recv-Q Send-Q Local Address:Port Peer Address:Port
-1668710080 0 rtnl:nl_wraparound/293 *
After:
[root@fedora ~]# ss -f netlink
Recv-Q Send-Q Local Address:Port Peer Address:Port
2147483072 0 rtnl:nl_wraparound/290 *
^
`--- INT_MAX - 576
Severity
5.5 (Medium)
Assigner
References
11 references
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9da025150b7c14a8390fc06aea314c0a4011e82c
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fd69af06101090eaa60b3d216ae715f9c0a58e5b (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 76602d8e13864524382b0687dc32cd8f19164d5a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 55baecb9eb90238f60a8350660d6762046ebd3bd (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4b8e18af7bea92f8b7fb92d40aeae729209db250 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cd7ff61bfffd7000143c42bbffb85eeb792466d6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.4.296 , ≤ 5.4.* (semver) Unaffected: 5.10.240 , ≤ 5.10.* (semver) Unaffected: 5.15.189 , ≤ 5.15.* (semver) Unaffected: 6.1.146 , ≤ 6.1.* (semver) Unaffected: 6.6.99 , ≤ 6.6.* (semver) Unaffected: 6.12.39 , ≤ 6.12.* (semver) Unaffected: 6.15.7 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (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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{
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetlink: Fix wraparounds of sk-\u003esk_rmem_alloc.\n\nNetlink has this pattern in some places\n\n if (atomic_read(\u0026sk-\u003esk_rmem_alloc) \u003e sk-\u003esk_rcvbuf)\n \tatomic_add(skb-\u003etruesize, \u0026sk-\u003esk_rmem_alloc);\n\n, which has the same problem fixed by commit 5a465a0da13e (\"udp:\nFix multiple wraparounds of sk-\u003esk_rmem_alloc.\").\n\nFor example, if we set INT_MAX to SO_RCVBUFFORCE, the condition\nis always false as the two operands are of int.\n\nThen, a single socket can eat as many skb as possible until OOM\nhappens, and we can see multiple wraparounds of sk-\u003esk_rmem_alloc.\n\nLet\u0027s fix it by using atomic_add_return() and comparing the two\nvariables as unsigned int.\n\nBefore:\n [root@fedora ~]# ss -f netlink\n Recv-Q Send-Q Local Address:Port Peer Address:Port\n -1668710080 0 rtnl:nl_wraparound/293 *\n\nAfter:\n [root@fedora ~]# ss -f netlink\n Recv-Q Send-Q Local Address:Port Peer Address:Port\n 2147483072 0 rtnl:nl_wraparound/290 *\n ^\n `--- INT_MAX - 576"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netlink: Se corrigen los wraparounds de sk-\u0026gt;sk_rmem_alloc. Netlink presenta este patr\u00f3n en algunos lugares if (atomic_read(\u0026amp;sk-\u0026gt;sk_rmem_alloc) \u0026gt; sk-\u0026gt;sk_rcvbuf) atomic_add(skb-\u0026gt;truesize, \u0026amp;sk-\u0026gt;sk_rmem_alloc); , que presenta el mismo problema corregido por el commit 5a465a0da13e (\"udp: Se corrigen m\u00faltiples wraparounds de sk-\u0026gt;sk_rmem_alloc.\"). Por ejemplo, si establecemos INT_MAX en SO_RCVBUFFORCE, la condici\u00f3n siempre es falsa, ya que los dos operandos son de tipo int. En ese caso, un solo socket puede consumir tantos skb como sea posible hasta que se produzca un OOM, y podemos observar m\u00faltiples wraparounds de sk-\u0026gt;sk_rmem_alloc. Para solucionarlo, usemos atomic_add_return() y comparemos las dos variables como enteros sin signo. Antes: [root@fedora ~]# ss -f netlink Recv-Q Send-Q Direcci\u00f3n local: Puerto Direcci\u00f3n del par: Puerto -1668710080 0 rtnl:nl_wraparound/293 * Despu\u00e9s: [root@fedora ~]# ss -f netlink Recv-Q Send-Q Direcci\u00f3n local: Puerto Direcci\u00f3n del par: Puerto 2147483072 0 rtnl:nl_wraparound/290 * ^ `--- INT_MAX - 576"
}
],
"id": "CVE-2025-38465",
"lastModified": "2026-06-17T09:16:54.803",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2025-07-25T16:15:32.527",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/4b8e18af7bea92f8b7fb92d40aeae729209db250"
},
{
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},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
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"description": [
{
"lang": "en",
"value": "CWE-401"
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],
"source": "nvd@nist.gov",
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},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T01:08:51+00:00",
"cve": "CVE-2025-38465",
"id": "CVE-2025-38465",
"initial_release_date": "2025-07-25T00:00:00+00:00",
"product_status:known_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: netlink: Fix wraparounds of sk-\u003esk_rmem_alloc.",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38465.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-29T01:18:45Z",
"cve": "CVE-2025-38465",
"id": "CVE-2025-38465",
"initial_release_date": "2025-07-25T23:22:43Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "744",
"product_status:recommended": "511",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-38465",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38465.json",
"version": "65"
}
}
}
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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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