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.
Product status
d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 before 6d345136c9b875f065d226908a29c25cdf9343f8
52da02521ede55fb86546c3fffd9377b3261b91f before e1b7932af47f92432be8303d2439d1bf77b0be23
34a949e7a0869dfa31a40416d2a56973fae1807b before cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38
d9ccb18f83ea2bb654289b6ecf014fd267cc988b before 3c13db3e47e170bab19e574404e7b6be45ea873d
d9ccb18f83ea2bb654289b6ecf014fd267cc988b before 46aeb66e9e54ed0d56c18615e1c3dbd502b327ab
d9ccb18f83ea2bb654289b6ecf014fd267cc988b before 54e6fe9dd3b0e7c481c2228782c9494d653546da
11edcd026012ac18acee0f1514db3ed1b160fc6f
6.13
Any version before 6.13
6.1.148
6.6.102
6.12.42
6.15.10
6.16.1
6.17
References
git.kernel.org/...c/6d345136c9b875f065d226908a29c25cdf9343f8
git.kernel.org/...c/e1b7932af47f92432be8303d2439d1bf77b0be23
git.kernel.org/...c/cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38
git.kernel.org/...c/3c13db3e47e170bab19e574404e7b6be45ea873d
git.kernel.org/...c/46aeb66e9e54ed0d56c18615e1c3dbd502b327ab
git.kernel.org/...c/54e6fe9dd3b0e7c481c2228782c9494d653546da
