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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-63968

ipv6: fix possible infinite loop in fib6_select_path()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible infinite loop in fib6_select_path() Found while auditing the same pattern Sashiko reported in rt6_fill_node() [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(&first->fib6_siblings) without waiting for RCU readers; first->fib6_siblings.next then still points into the old ring and this softirq-side walker never reaches &first->fib6_siblings as its terminator. fib6_purge_rt() always WRITE_ONCE()s first->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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 to < 3948a7d92f7678e89e1776bb2d169afcad63b1aeaffected
  • 52da02521ede55fb86546c3fffd9377b3261b91f to < c87cd3cb309634bc8f50a54e2079424f219ac21faffected
  • 34a949e7a0869dfa31a40416d2a56973fae1807b to < 0f7b73c3452635de83b8711b31abdda8e49aad7baffected
  • d9ccb18f83ea2bb654289b6ecf014fd267cc988b to < ab9a10969a907b472a0196d999c08ff7144172e3affected
  • d9ccb18f83ea2bb654289b6ecf014fd267cc988b to < 9b9d5bd6e3d4c9cecab5407604b690684b2532d2affected
  • d9ccb18f83ea2bb654289b6ecf014fd267cc988b to < 9c7da87c2dc860bb17ca1ece942495d28b1ce3b9affected
  • 11edcd026012ac18acee0f1514db3ed1b160fc6faffected
  • 6.1.128 to < 6.1.176affected
  • 6.6.75 to < 6.6.143affected
  • 6.12.2 to < 6.12.93affected
  • 6.11.11 to < 6.12affected

Linux Linux

Default version status: affected

  • 6.13affected
  • 0 to < 6.13unaffected
  • 6.1.176 to ≤ 6.1.*unaffected
  • 6.6.143 to ≤ 6.6.*unaffected
  • 6.12.93 to ≤ 6.12.*unaffected
  • 6.18.35 to ≤ 6.18.*unaffected
  • 7.0.12 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References