CVE-2025-38588: ipv6: prevent infinite loop in rt6_nlmsg_size()

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: prevent infinite loop in rt6_nlmsg_size() While testing prior patch, I was able to trigger an infinite loop in rt6_nlmsg_size() in the following place: list_for_each_entry_rcu(sibling, &f6i->fib6_siblings, fib6_siblings) { rt6_nh_nlmsg_size(sibling->fib6_nh, &nexthop_len); } This is because fib6_del_route() and fib6_add_rt2node() uses list_del_rcu(), which can confuse rcu readers, because they might no longer see the head of the list. Restart the loop if f6i->fib6_nsiblings is zero.

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 < 6d345136c9b875f065d226908a29c25cdf9343f8affected
52da02521ede55fb86546c3fffd9377b3261b91f to < e1b7932af47f92432be8303d2439d1bf77b0be23affected
34a949e7a0869dfa31a40416d2a56973fae1807b to < cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38affected
d9ccb18f83ea2bb654289b6ecf014fd267cc988b to < 3c13db3e47e170bab19e574404e7b6be45ea873daffected
d9ccb18f83ea2bb654289b6ecf014fd267cc988b to < 46aeb66e9e54ed0d56c18615e1c3dbd502b327abaffected
d9ccb18f83ea2bb654289b6ecf014fd267cc988b to < 54e6fe9dd3b0e7c481c2228782c9494d653546daaffected
11edcd026012ac18acee0f1514db3ed1b160fc6faffected
6.1.128 to < 6.1.148affected
6.6.75 to < 6.6.102affected
6.12.2 to < 6.12.42affected
6.11.11 to < 6.12affected

Linux Linux

Default version status: affected

6.13affected
0 to < 6.13unaffected
6.1.148 to ≤ 6.1.*unaffected
6.6.102 to ≤ 6.6.*unaffected
6.12.42 to ≤ 6.12.*unaffected
6.15.10 to ≤ 6.15.*unaffected
6.16.1 to ≤ 6.16.*unaffected
6.17 to ≤ *unaffected

CVE-2025-38588

ipv6: prevent infinite loop in rt6_nlmsg_size()

Description

Affected products

Linux Linux

Linux Linux

References