CVE-2026-63969

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 < b014a63d2f2c2c767762b548381882dfb1655529affected
LinuxLinux52da02521ede55fb86546c3fffd9377b3261b91f < 279853aec9f58d5cd723e6e5617c1c3337b30383affected
LinuxLinux34a949e7a0869dfa31a40416d2a56973fae1807b < c65b1f60237daac7c56c2652e064cc566a45dc81affected
LinuxLinuxd9ccb18f83ea2bb654289b6ecf014fd267cc988b < dc36a04621dcc2447dae428709207810b6c06e14affected
LinuxLinuxd9ccb18f83ea2bb654289b6ecf014fd267cc988b < 5e40de719ee76b8d96e2556ce36dbd3bd07bf37daffected
LinuxLinuxd9ccb18f83ea2bb654289b6ecf014fd267cc988b < 9f72412bcf60144f252b0d6205106abf14344abcaffected
LinuxLinux11edcd026012ac18acee0f1514db3ed1b160fc6faffected
LinuxLinux6.1.128 < 6.1.176affected
LinuxLinux6.6.75 < 6.6.143affected
LinuxLinux6.12.2 < 6.12.93affected
LinuxLinux6.11.11 < 6.12affected
LinuxLinux6.13affected
LinuxLinux0 < 6.13unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References