CVE-2026-63969 (GCVE-0-2026-63969)
Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55
VLAI
EPSS
VEX
Title
ipv6: fix possible infinite loop in rt6_fill_node()
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipv6: fix possible infinite loop in rt6_fill_node()
Sashiko reported this issue [1]. Apply the same fix as
commit f8d8ce1b515a ("ipv6: fix possible infinite loop in fib6_info_uses_dev()").
Writers holding tb6_lock can list_del_rcu(&rt->fib6_siblings)
without waiting for RCU readers; rt->fib6_siblings.next then still
points into the old ring and this softirq-side walker never reaches
&rt->fib6_siblings, causing a CPU stall. fib6_del_route() always
WRITE_ONCE()s rt->fib6_nsiblings to 0 before list_del_rcu(), so an
inside-loop check is a reliable detach signal.
[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev
Severity
No CVSS data available.
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 , < b014a63d2f2c2c767762b548381882dfb1655529
(git)
Affected: 52da02521ede55fb86546c3fffd9377b3261b91f , < 279853aec9f58d5cd723e6e5617c1c3337b30383 (git) Affected: 34a949e7a0869dfa31a40416d2a56973fae1807b , < c65b1f60237daac7c56c2652e064cc566a45dc81 (git) Affected: d9ccb18f83ea2bb654289b6ecf014fd267cc988b , < dc36a04621dcc2447dae428709207810b6c06e14 (git) Affected: d9ccb18f83ea2bb654289b6ecf014fd267cc988b , < 5e40de719ee76b8d96e2556ce36dbd3bd07bf37d (git) Affected: d9ccb18f83ea2bb654289b6ecf014fd267cc988b , < 9f72412bcf60144f252b0d6205106abf14344abc (git) Affected: 11edcd026012ac18acee0f1514db3ed1b160fc6f (git) Affected: 6.1.128 , < 6.1.176 (semver) Affected: 6.6.75 , < 6.6.143 (semver) Affected: 6.12.2 , < 6.12.93 (semver) Affected: 6.11.11 , < 6.12 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.13
Unaffected: 0 , < 6.13 (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) |
guessed |
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{
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"version": "6.1.176",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.143",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.93",
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},
{
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"status": "unaffected",
"version": "7.0.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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{
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},
{
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix possible infinite loop in rt6_fill_node()\n\nSashiko reported this issue [1]. Apply the same fix as\ncommit f8d8ce1b515a (\"ipv6: fix possible infinite loop in fib6_info_uses_dev()\").\n\nWriters holding tb6_lock can list_del_rcu(\u0026rt-\u003efib6_siblings)\nwithout waiting for RCU readers; rt-\u003efib6_siblings.next then still\npoints into the old ring and this softirq-side walker never reaches\n\u0026rt-\u003efib6_siblings, causing a CPU stall. fib6_del_route() always\nWRITE_ONCE()s rt-\u003efib6_nsiblings to 0 before list_del_rcu(), so an\ninside-loop check is a reliable detach signal.\n\n[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev"
}
],
"providerMetadata": {
"dateUpdated": "2026-07-19T14:55:56.330Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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{
"url": "https://git.kernel.org/stable/c/279853aec9f58d5cd723e6e5617c1c3337b30383"
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{
"url": "https://git.kernel.org/stable/c/c65b1f60237daac7c56c2652e064cc566a45dc81"
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{
"url": "https://git.kernel.org/stable/c/9f72412bcf60144f252b0d6205106abf14344abc"
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"datePublished": "2026-07-19T14:55:56.330Z",
"dateReserved": "2026-07-19T07:54:57.024Z",
"dateUpdated": "2026-07-19T14:55:56.330Z",
"state": "PUBLISHED"
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"cveTags": [],
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix possible infinite loop in rt6_fill_node()\n\nSashiko reported this issue [1]. Apply the same fix as\ncommit f8d8ce1b515a (\"ipv6: fix possible infinite loop in fib6_info_uses_dev()\").\n\nWriters holding tb6_lock can list_del_rcu(\u0026rt-\u003efib6_siblings)\nwithout waiting for RCU readers; rt-\u003efib6_siblings.next then still\npoints into the old ring and this softirq-side walker never reaches\n\u0026rt-\u003efib6_siblings, causing a CPU stall. fib6_del_route() always\nWRITE_ONCE()s rt-\u003efib6_nsiblings to 0 before list_del_rcu(), so an\ninside-loop check is a reliable detach signal.\n\n[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev"
}
],
"id": "CVE-2026-63969",
"lastModified": "2026-07-30T14:51:11.223",
"metrics": {},
"published": "2026-07-19T16:17:15.947",
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"current_release_date": "2026-08-07T13:49:33+00:00",
"cve": "CVE-2026-63969",
"id": "CVE-2026-63969",
"initial_release_date": "2026-07-19T00:00:00+00:00",
"product_status:known_affected": "198",
"product_status:known_not_affected": "76",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ipv6: fix possible infinite loop in rt6_fill_node()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63969.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-18T00:45:39Z",
"cve": "CVE-2026-63969",
"id": "CVE-2026-63969",
"initial_release_date": "2026-07-21T13:02:30Z",
"product_status:known_affected": "482",
"product_status:known_not_affected": "251",
"product_status:recommended": "107",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-63969",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63969.json",
"version": "11"
}
}
}
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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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