CVE-2026-63968 (GCVE-0-2026-63968)
Vulnerability from cvelistv5
Published
2026-07-19 14:55
Modified
2026-10-19 20:17
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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
References
Impacted products
Vendor Product Version
Linux Linux Version: d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2
Version: 52da02521ede55fb86546c3fffd9377b3261b91f
Version: 34a949e7a0869dfa31a40416d2a56973fae1807b
Version: d9ccb18f83ea2bb654289b6ecf014fd267cc988b
Version: d9ccb18f83ea2bb654289b6ecf014fd267cc988b
Version: d9ccb18f83ea2bb654289b6ecf014fd267cc988b
Version: 11edcd026012ac18acee0f1514db3ed1b160fc6f
Version: 6.1.128   ≤
Version: 6.6.75   ≤
Version: 6.12.2   ≤
Version: 6.11.11   ≤
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