CVE-2025-38588

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (2)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/3c13db3e47e170bab19e574404e7b6be45ea873d ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/3c13db3e47e170bab19e574404e7b6be45ea873dPatch
• https://git.kernel.org/stable/c/46aeb66e9e54ed0d56c18615e1c3dbd502b327abPatch
• https://git.kernel.org/stable/c/54e6fe9dd3b0e7c481c2228782c9494d653546daPatch
• https://git.kernel.org/stable/c/6d345136c9b875f065d226908a29c25cdf9343f8Patch
• https://git.kernel.org/stable/c/cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38Patch
• https://git.kernel.org/stable/c/e1b7932af47f92432be8303d2439d1bf77b0be23Patch
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlAdvisory