Vulnerability-Lookup

GHSA-WC3H-5QQJ-XWHM

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-19 18:31

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63969"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:15Z",
    "severity": null
  },
  "details": "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": "GHSA-wc3h-5qqj-xwhm",
  "modified": "2026-07-19T18:31:48Z",
  "published": "2026-07-19T18:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63969"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/279853aec9f58d5cd723e6e5617c1c3337b30383"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e40de719ee76b8d96e2556ce36dbd3bd07bf37d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f72412bcf60144f252b0d6205106abf14344abc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b014a63d2f2c2c767762b548381882dfb1655529"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c65b1f60237daac7c56c2652e064cc566a45dc81"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc36a04621dcc2447dae428709207810b6c06e14"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-63969 (GCVE-0-2026-63969)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55

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

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/b014a63d2f2c2c767…
https://git.kernel.org/stable/c/279853aec9f58d5cd…
https://git.kernel.org/stable/c/c65b1f60237daac7c…
https://git.kernel.org/stable/c/dc36a04621dcc2447…
https://git.kernel.org/stable/c/5e40de719ee76b8d9…
https://git.kernel.org/stable/c/9f72412bcf60144f2…

Impacted products

2 products

Vendor	Product	Version
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)
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)

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          "programFiles": [
            "net/ipv6/route.c"
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              "versionType": "git"
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          ],
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              "status": "unaffected",
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
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        }
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      "cpeApplicability": [
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          "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",
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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",
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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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-WC3H-5QQJ-XWHM

CVE-2026-63969 (GCVE-0-2026-63969)

Tags

Sightings

Nomenclature