CVE-2025-38588

ipv6: prevent infinite loop in rt6_nlmsg_size()

State: Published
Severity: Not scored
Published: Aug 19, 2025
Updated: May 23, 2026
Reserved: Apr 16, 2025

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 to before 6d345136c9b875f065d226908a29c25cdf9343f8Affected 52da02521ede55fb86546c3fffd9377b3261b91f to before e1b7932af47f92432be8303d2439d1bf77b0be23Affected 34a949e7a0869dfa31a40416d2a56973fae1807b to before cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38Affected d9ccb18f83ea2bb654289b6ecf014fd267cc988b to before 3c13db3e47e170bab19e574404e7b6be45ea873dAffected d9ccb18f83ea2bb654289b6ecf014fd267cc988b to before 46aeb66e9e54ed0d56c18615e1c3dbd502b327abAffected d9ccb18f83ea2bb654289b6ecf014fd267cc988b to before 54e6fe9dd3b0e7c481c2228782c9494d653546daAffected 11edcd026012ac18acee0f1514db3ed1b160fc6fAffected 6.1.128 to before 6.1.148Affected 6.6.75 to before 6.6.102Affected 6.12.2 to before 6.12.42Affected 6.11.11 to before 6.12Affected
LinuxLinux	6.13Affected before 6.13Not affected 6.1.148 through 6.1.Not affected 6.6.102 through 6.6.Not affected 6.12.42 through 6.12.Not affected 6.15.10 through 6.15.Not affected 6.16.1 through 6.16.*Not affected 6.17 and laterNot affected

Product

Versions

LinuxLinux

d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 to before 6d345136c9b875f065d226908a29c25cdf9343f8Affected
52da02521ede55fb86546c3fffd9377b3261b91f to before e1b7932af47f92432be8303d2439d1bf77b0be23Affected
34a949e7a0869dfa31a40416d2a56973fae1807b to before cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38Affected
d9ccb18f83ea2bb654289b6ecf014fd267cc988b to before 3c13db3e47e170bab19e574404e7b6be45ea873dAffected
d9ccb18f83ea2bb654289b6ecf014fd267cc988b to before 46aeb66e9e54ed0d56c18615e1c3dbd502b327abAffected
d9ccb18f83ea2bb654289b6ecf014fd267cc988b to before 54e6fe9dd3b0e7c481c2228782c9494d653546daAffected
11edcd026012ac18acee0f1514db3ed1b160fc6fAffected
6.1.128 to before 6.1.148Affected
6.6.75 to before 6.6.102Affected
6.12.2 to before 6.12.42Affected
6.11.11 to before 6.12Affected

LinuxLinux

6.13Affected
before 6.13Not affected
6.1.148 through 6.1.*Not affected
6.6.102 through 6.6.*Not affected
6.12.42 through 6.12.*Not affected
6.15.10 through 6.15.*Not affected
6.16.1 through 6.16.*Not affected
6.17 and laterNot affected

References

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