CVE-2026-31738 (GCVE-0-2026-31738)
Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-23 16:05
VLAI
EPSS
VEX
Title
vxlan: validate ND option lengths in vxlan_na_create
Summary
In the Linux kernel, the following vulnerability has been resolved:
vxlan: validate ND option lengths in vxlan_na_create
vxlan_na_create() walks ND options according to option-provided
lengths. A malformed option can make the parser advance beyond the
computed option span or use a too-short source LLADDR option payload.
Validate option lengths against the remaining NS option area before
advancing, and only read source LLADDR when the option is large enough
for an Ethernet address.
Severity
5.5 (Medium)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < 901c1dd3bab2955d7e664f914c374c8c3ac2b958
(git)
Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < e476745917a1e288eb15e7ff49d286a86a4861d3 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < 2029712fb2c87e9a8c75094906f2ee29bf08c500 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < 602596c69a70e50d9ab8c6ae0290a01f88229dd7 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < de20d2e3b9179d132f5f5b44e490d7c916c6321b (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < eddfce70a6f3107d1679b0c2fcbeb96b593bd679 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < b69c4236255bd8de16cd876e58c6f0867d1d78b1 (git) Affected: 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa , < afa9a05e6c4971bd5586f1b304e14d61fb3d9385 (git) Affected: d8be18c52dbc94989f6d74637b731af39cd3d902 (git) Affected: 3927dace523706cc00f808520eaf2125dd7c07b5 (git) Affected: 3.12.18 , < 3.13 (semver) Affected: 3.13.10 , < 3.14 (semver) |
guessed | |
| Linux | Linux |
Affected:
3.14
Unaffected: 0 , < 3.14 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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}
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"id": "CVE-2026-31738",
"lastModified": "2026-06-17T10:34:20.430",
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
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"scope": "UNCHANGED",
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]
},
"published": "2026-05-01T15:16:36.473",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T07:27:53+00:00",
"cve": "CVE-2026-31738",
"id": "CVE-2026-31738",
"initial_release_date": "2026-05-01T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: vxlan: validate ND option lengths in vxlan_na_create",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31738.json",
"version": "3"
}
}
}
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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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