CVE-2026-80792 (GCVE-0-2026-80792)
Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-10-19 08:43
VLAI
EPSS
VEX
Title
ipv6: fix use-after-free in ip6_finish_output2()
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv6: fix use-after-free in ip6_finish_output2()
ip6_finish_output2() caches a pointer to the IPv6 destination
address (daddr) before invoking lwtunnel_xmit(). The LWT-BPF
transmit path or other encapsulation operations within
lwtunnel_xmit() can reallocate the skb head, freeing the memory
that daddr points to. When lwtunnel_xmit() returns
LWTUNNEL_XMIT_CONTINUE, the function continues to use the stale
daddr pointer to compute the nexthop and to look up or create the
neighbour entry. This results in a use-after-free read, which can
leak sensitive kernel data, pollute the neighbour table with
arbitrary values, misdirect traffic, or crash the system.
Fix this by re-fetching the IPv6 header and the destination
address pointer after lwtunnel_xmit() returns
LWTUNNEL_XMIT_CONTINUE, ensuring that the subsequent nexthop
computation and neighbour lookup operate on valid memory.
Severity
No CVSS data available.
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4132c4ad00ddbf3a175ea0d2c775b662a32f4c85 , < 75e0a544ebe9af663ef53ca21e9e9185c51fb54a
(git)
Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < c95f01b78266828a57060d754fcbfc92123a98ed (git) Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < d960881b9312e781a3429aabceb223ce6b7c882f (git) Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < 087ee0d914aaae929f1660c9ca878e367655ba1a (git) Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < 3c770ac4e6f07af7c7b40c474a3efc61ffed7862 (git) Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < 3dc98e5fe82d069dd29b124ffbdb679331dfea43 (git) Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < 99219c82804f266189388e8bf1cf5135d10d5515 (git) Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < 73a187384a8c8b983c7fea046d716b6752a1e7a3 (git) Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < d0d48d999b0eee6bb176ef4e39d9be868fa80f7e (git) Affected: 1598154fd28ffa4a55beae1970475fd6776554b6 (git) Affected: 5.10.233 , < 5.10.267 (semver) Affected: 5.4.289 , < 5.5 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.15
Unaffected: 0 , < 5.15 (semver) Unaffected: 5.10.267 , ≤ 5.10.* (semver) Unaffected: 5.15.218 , ≤ 5.15.* (semver) Unaffected: 6.1.185 , ≤ 6.1.* (semver) Unaffected: 6.6.154 , ≤ 6.6.* (semver) Unaffected: 6.12.106 , ≤ 6.12.* (semver) Unaffected: 6.18.47 , ≤ 6.18.* (semver) Unaffected: 7.1.11 , ≤ 7.1.* (semver) Unaffected: 7.2.1 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
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}
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},
{
"url": "https://git.kernel.org/stable/c/d0d48d999b0eee6bb176ef4e39d9be868fa80f7e"
}
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix use-after-free in ip6_finish_output2()\n\nip6_finish_output2() caches a pointer to the IPv6 destination\naddress (daddr) before invoking lwtunnel_xmit(). The LWT-BPF\ntransmit path or other encapsulation operations within\nlwtunnel_xmit() can reallocate the skb head, freeing the memory\nthat daddr points to. When lwtunnel_xmit() returns\nLWTUNNEL_XMIT_CONTINUE, the function continues to use the stale\ndaddr pointer to compute the nexthop and to look up or create the\nneighbour entry. This results in a use-after-free read, which can\nleak sensitive kernel data, pollute the neighbour table with\narbitrary values, misdirect traffic, or crash the system.\n\nFix this by re-fetching the IPv6 header and the destination\naddress pointer after lwtunnel_xmit() returns\nLWTUNNEL_XMIT_CONTINUE, ensuring that the subsequent nexthop\ncomputation and neighbour lookup operate on valid memory."
}
],
"id": "CVE-2026-80792",
"lastModified": "2026-10-19T09:17:13.330",
"metrics": {},
"published": "2026-09-04T16:18:05.460",
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},
{
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"url": "https://git.kernel.org/stable/c/75e0a544ebe9af663ef53ca21e9e9185c51fb54a"
},
{
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{
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},
{
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-10-31T07:35:34+00:00",
"cve": "CVE-2026-80792",
"id": "CVE-2026-80792",
"initial_release_date": "2026-09-04T00:00:00+00:00",
"product_status:fixed": "1693",
"product_status:known_affected": "23",
"product_status:known_not_affected": "91",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ipv6: fix use-after-free in ip6_finish_output2()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80792.json",
"version": "3"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.