CVE-2026-63992 (GCVE-0-2026-63992)
Vulnerability from cvelistv5 – Published: 2026-07-19 14:56 – Updated: 2026-08-05 12:37
VLAI
EPSS
VEX
Title
tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()
Summary
In the Linux kernel, the following vulnerability has been resolved:
tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()
In some cases, iptunnel_pmtud_check_icmp() can be called while
skb transport header is not set.
This triggers an out-of-bound access, because
(typeof(skb->transport_header))~0U is 65535.
Access the icmp header based on IPv4 network header,
after making sure icmp->type is present in skb linear part.
Note that iptunnel_pmtud_check_icmpv6()) is fine.
Severity
9.1 (Critical)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < 5a92cb45e34749865d03daf8d3500f77b5f6644c
(git)
Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < c7b7ec3e69e673c0d6b57f74d21da50c485c598e (git) Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < 7f4f7efe7f30edd29c4988de01728bf2398217e4 (git) Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < e917d0c69f01af2bb4fbea2b66d560a53b3ac7ec (git) Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < a096b6e34f602950af9a2b0856cd93a5f4c276d7 (git) Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < 43368636c663cff6e59dde93cf4b8e43ac28eb93 (git) Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < cb549df9ce4ee15c9d5b19ddab12cf2128e4313c (git) Affected: 4cb47a8644cc9eb8ec81190a50e79e6530d0297f , < 509323077ef79a26ba0c60bb556e45c12c398b2d (git) |
|
| Linux | Linux |
Affected:
5.9
Unaffected: 0 , < 5.9 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
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"url": "https://git.kernel.org/stable/c/a096b6e34f602950af9a2b0856cd93a5f4c276d7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/c7b7ec3e69e673c0d6b57f74d21da50c485c598e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/cb549df9ce4ee15c9d5b19ddab12cf2128e4313c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/e917d0c69f01af2bb4fbea2b66d560a53b3ac7ec"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-10-08T23:33:38+00:00",
"cve": "CVE-2026-63992",
"id": "CVE-2026-63992",
"initial_release_date": "2026-07-19T00:00:00+00:00",
"product_status:fixed": "453",
"product_status:known_affected": "113",
"product_status:known_not_affected": "29",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63992.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-10-08T17:09:32Z",
"cve": "CVE-2026-63992",
"id": "CVE-2026-63992",
"initial_release_date": "2026-07-21T13:02:01Z",
"product_status:known_affected": "488",
"product_status:known_not_affected": "121",
"product_status:recommended": "444",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-63992",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63992.json",
"version": "16"
}
}
}
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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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