UnratedFix available
ipv6: prevent infinite loop in rt6_nlmsg_size()
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.1.148, 6.12.42, 6.15.10, 6.16.1, 6.6.102
- CVEs
- CVE-2025-38588
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 15:24 UTC · Revision 1
Source evidence
ipv6: prevent infinite loop in rt6_nlmsg_size()
core-osv · Original sourcePublished 19 Aug 2025, 17:03 UTC
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.
osv:CVE-2025-38588
Kernel
Fixed versions: 6.1.148, 6.6.102, 6.12.42, 6.15.10, 6.16.1
Complete source record
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"title": "ipv6: prevent infinite loop in rt6_nlmsg_size()",
"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.",
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"modified": "2026-10-28T02:30:36.994426377Z",
"provider": "osv",
"references": [
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