Vulnerability-Lookup

GHSA-F9FR-3JHC-3VFJ

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

ipv6: do not warn on route notification size race

fib6_info_hw_flags_set() sizes the skb with rt6_nlmsg_size() and later fills it with rt6_fill_node(). With nexthop compatibility mode enabled, a concurrent replacement can grow the group between these independent snapshots. rt6_fill_node() can then legitimately return -EMSGSIZE, so the warning does not prove a sizing bug.

Remove the warning. The existing error path still frees the skb and reports the error to listeners.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99070"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: do not warn on route notification size race\n\nfib6_info_hw_flags_set() sizes the skb with rt6_nlmsg_size() and later\nfills it with rt6_fill_node().  With nexthop compatibility mode enabled,\na concurrent replacement can grow the group between these independent\nsnapshots.  rt6_fill_node() can then legitimately return -EMSGSIZE, so\nthe warning does not prove a sizing bug.\n\nRemove the warning.  The existing error path still frees the skb and\nreports the error to listeners.",
  "id": "GHSA-f9fr-3jhc-3vfj",
  "modified": "2026-10-23T15:31:37Z",
  "published": "2026-10-23T15:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99070"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/291fe0bafee78c95f9f2e7f579f17793fd5a1e5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ac7d92a4698e34e614c254359665b9de1f65283"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b112bd43f1172fb152e848570a957467008a5ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a3b935b6b6037eefb36bd27a60793a008358e8d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c97426ec649d99596d8969e1a052c16b14b7b485"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-99070 (GCVE-0-2026-99070)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:23 – Updated: 2026-10-23 12:23

Title

ipv6: do not warn on route notification size race

Summary

In the Linux kernel, the following vulnerability has been resolved: ipv6: do not warn on route notification size race fib6_info_hw_flags_set() sizes the skb with rt6_nlmsg_size() and later fills it with rt6_fill_node(). With nexthop compatibility mode enabled, a concurrent replacement can grow the group between these independent snapshots. rt6_fill_node() can then legitimately return -EMSGSIZE, so the warning does not prove a sizing bug. Remove the warning. The existing error path still frees the skb and reports the error to listeners.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7067 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/8a3b935b6b6037eef…
https://git.kernel.org/stable/c/7b112bd43f1172fb1…
https://git.kernel.org/stable/c/4ac7d92a4698e34e6…
https://git.kernel.org/stable/c/291fe0bafee78c95f…
https://git.kernel.org/stable/c/c97426ec649d99596…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 907eea486888cfe118c19759bbc4b8fca2e004df , < 8a3b935b6b6037eefb36bd27a60793a008358e8d (git) Affected: 907eea486888cfe118c19759bbc4b8fca2e004df , < 7b112bd43f1172fb152e848570a957467008a5ae (git) Affected: 907eea486888cfe118c19759bbc4b8fca2e004df , < 4ac7d92a4698e34e614c254359665b9de1f65283 (git) Affected: 907eea486888cfe118c19759bbc4b8fca2e004df , < 291fe0bafee78c95f9f2e7f579f17793fd5a1e5a (git) Affected: 907eea486888cfe118c19759bbc4b8fca2e004df , < c97426ec649d99596d8969e1a052c16b14b7b485 (git)
Linux	Linux	Affected: 5.12 Unaffected: 0 , < 5.12 (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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        {
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          "programFiles": [
            "net/ipv6/route.c"
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              "version": "6.18.57",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "7.2.*",
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              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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    "dateReserved": "2026-09-25T10:25:14.389Z",
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}

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.
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