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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00032.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Linux
  • Linux Kernel
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/3c13db3e47e170bab19e574404e7b6be45ea873d cve-icon cve-icon
https://git.kernel.org/stable/c/46aeb66e9e54ed0d56c18615e1c3dbd502b327ab cve-icon cve-icon
https://git.kernel.org/stable/c/54e6fe9dd3b0e7c481c2228782c9494d653546da cve-icon cve-icon
https://git.kernel.org/stable/c/6d345136c9b875f065d226908a29c25cdf9343f8 cve-icon cve-icon
https://git.kernel.org/stable/c/cd8d8bbd9ced4cc5d06d858f67d4aa87745e8f38 cve-icon cve-icon
https://git.kernel.org/stable/c/e1b7932af47f92432be8303d2439d1bf77b0be23 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025081916-CVE-2025-38588-cb2d@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-38588 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-38588 cve-icon
History

Thu, 21 Aug 2025 13:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Wed, 20 Aug 2025 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Moderate

Tue, 19 Aug 2025 17:15:00 +0000

Type Values Removed Values Added
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.
Title ipv6: prevent infinite loop in rt6_nlmsg_size()
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-08-19T17:03:09.856Z

Reserved: 2025-04-16T04:51:24.026Z

Link: CVE-2025-38588

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-08-19T17:15:36.383

Modified: 2025-08-20T14:40:17.713

Link: CVE-2025-38588

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-08-19T00:00:00Z

Links: CVE-2025-38588 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-08-21T12:59:08Z