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

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55
VLAI
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
Impacted 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)
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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)
Create a notification for this product.
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{
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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"
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    "dateReserved": "2026-07-19T07:54:57.024Z",
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    "state": "PUBLISHED"
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  }
}



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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

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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.