CVE-2025-38588
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.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 6.1.128 | 6.1.148 |
| linux / linux_kernel | 6.6.75 | 6.6.102 |
| linux / linux_kernel | 6.11.11 | 6.12 |
| linux / linux_kernel | 6.12.2 | 6.12.42 |
| linux / linux_kernel | 6.13 | 6.15.10 |
| linux / linux_kernel | 6.16 | 6.16.1 |
| debian / debian_linux | 11.0 | 11.0.x |
- https://git.kernel.org/stable/c/3c13db3e47e170bab19e574404e7b6be45ea873d
- https://git.kernel.org/stable/c/46aeb66e9e54ed0d56c18615e1c3dbd502b327ab
- https://git.kernel.org/stable/c/54e6fe9dd3b0e7c481c2228782c9494d653546da
- https://git.kernel.org/stable/c/6d345136c9b875f065d226908a29c25cdf9343f8
- https://git.kernel.org/stable/c/cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38
- https://git.kernel.org/stable/c/e1b7932af47f92432be8303d2439d1bf77b0be23
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
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