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Unscored CVE-2025-38588 EUVD-2025-27917GHSA-xmch-89f7-f57m

ipv6: prevent infinite loop in rt6_nlmsg_size()

Published Aug 19, 2025 · Updated Nov 5, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-fips Package: linux-azure Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.14 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-azure-nvidia-6.14 Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.19 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-6.8 Package: linux-intel Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-lowlatency Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.11 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lowlatency-hwe-6.8 Package: linux-nvidia Package: linux-nvidia-6.11 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-lowlatency Package: linux-nvidia-tegra Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.11 Package: linux-oem-6.14 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.3 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-raspi Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.5 Package: linux-riscv-6.8 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

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.

Affected products

VendorProductAffectedFixed
Linux Linux 6.1.128 – < 6.1.148, 6.6.75 – < 6.6.102, 6.12.2 – < 6.12.42, 6.11.11 – < 6.12, 6.13 6.1.148

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 linux 6.16.3-1 —
Debian 13 linux 6.12.43-1 —
Debian 12 linux 6.1.148-1 —
Debian 11 linux-6.1 6.1.153-1~deb11u1 DLA-4328-1

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield 6.8.0-1016.20 —
Ubuntu 25.10 linux-azure-fde No fix yet —
Ubuntu 24.04 LTS linux 6.8.0-100.100 USN-8028-1
Ubuntu 24.04 LTS linux-aws +1 6.8.0-1046.49 USN-8028-5
Ubuntu 24.04 LTS linux-aws-6.14 +2 6.14.0-1017.17~24.04.1 USN-7934-1, USN-7879-3
Ubuntu 24.04 LTS linux-azure 6.8.0-1046.52 USN-8074-1
Ubuntu 24.04 LTS linux-azure-fde 6.8.0-1046.53 —
Ubuntu 24.04 LTS linux-azure-nvidia 6.8.0-1039.42 —
Ubuntu 24.04 LTS linux-gcp 6.8.0-1047.50 USN-8031-3
Ubuntu 24.04 LTS linux-gcp-6.14 6.14.0-1020.21~24.04.1 USN-7879-4
Ubuntu 24.04 LTS linux-gke 6.8.0-1043.48 USN-8031-3
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1030.33 USN-8028-5
Ubuntu 24.04 LTS linux-hwe-6.14 6.14.0-36.36~24.04.1 USN-7879-1
Ubuntu 24.04 LTS linux-ibm 6.8.0-1044.44 USN-8028-8
Ubuntu 24.04 LTS linux-intel +12 No fix yet —
Ubuntu 24.04 LTS linux-lowlatency 6.8.0-100.100.1 USN-8052-1
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1046.49.1 USN-8028-7
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1020.20 —
Ubuntu 24.04 LTS linux-oem-6.14 6.14.0-1016.16 USN-7880-1
Ubuntu 24.04 LTS linux-oracle 6.8.0-1043.44 USN-8028-5
Ubuntu 24.04 LTS linux-raspi 6.8.0-1047.51 USN-8028-1
Ubuntu 24.04 LTS linux-riscv-6.14 6.14.0-36.36.1~24.04.1 —
Ubuntu 24.04 LTS linux-xilinx 6.8.0-1023.24 USN-8052-2
Ubuntu 22.04 LTS linux-aws-6.8 +1 6.8.0-1046.49~22.04.1 USN-8028-5
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1051.57~22.04.1 USN-8126-1
Ubuntu 22.04 LTS linux-azure-fde-6.8 6.8.0-1046.53~22.04.1 —
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1047.50~22.04.2 USN-8031-1
Ubuntu 22.04 LTS linux-hwe-6.8 +1 6.8.0-100.100~22.04.1 USN-8028-6
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1044.44~22.04.1 USN-8028-8
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.8 6.8.0-100.100.1~22.04.1 USN-8028-6
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1043.44~22.04.1 USN-8028-5
Ubuntu 22.04 LTS linux-riscv +32 No fix yet —
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Show 5 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-raspi-realtime 6.8.0-2037.38 USN-8028-3
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1041.42 USN-8028-3
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.14 6.14.0-1016.16~24.04.1 USN-7879-2
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1041.42~22.04.1 USN-8028-2
Ubuntu Pro FIPS-updates 24.04 LTS linux-aws-fips 6.8.0-1046.49+fips1 USN-8028-4
Ubuntu Pro FIPS-updates 24.04 LTS linux-azure-fips 6.8.0-1046.52+fips1 USN-8074-2
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips 6.8.0-100.100+fips1 USN-8028-4
Ubuntu Pro FIPS-updates 24.04 LTS linux-gcp-fips 6.8.0-1047.50+fips1 USN-8031-2

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +6 6.4.0-150700.53.16.1 SUSE-SU-2025:03290-1
SLES 15 SP7 kernel-azure +1 6.4.0-150700.20.15.2 SUSE-SU-2025:03633-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.16.1.150700.17.11.2 SUSE-SU-2025:03290-1
SLES 15 SP7 kernel-syms-azure 6.4.0-150700.20.15.1 SUSE-SU-2025:03633-1
SLES 15 SP6 kernel-64kb +6 6.4.0-150600.23.70.1 SUSE-SU-2025:03301-1
SLES 15 SP6 kernel-azure +2 6.4.0-150600.8.52.1 SUSE-SU-2025:03634-1
SLES 15 SP6 kernel-coco +3 6.4.0-15061.32.coco15sp6.1 SUSE-SU-2025:03602-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.70.1.150600.12.30.2 SUSE-SU-2025:03301-1
Show 9 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 kernel-64kb +7 6.12.0-160000.6.1 SUSE-SU-2025:21139-1
SLES for SAP 16.0 kernel-default-base 6.12.0-160000.6.1.160000.2.4 SUSE-SU-2025:21139-1
SLES for SAP 16.0 kernel-livepatch-SLE16_Update_0 5-160000.4.3 SUSE-SU-2026:20149-1
SLES 16.0 kernel-64kb +7 6.12.0-160000.6.1 SUSE-SU-2025:21179-1, SUSE-SU-2025:21139-1
SLES 16.0 kernel-default-base 6.12.0-160000.6.1.160000.2.4 SUSE-SU-2025:21139-1
SLES 16.0 kernel-livepatch-SLE16_Update_0 5-160000.4.3 SUSE-SU-2026:20149-1
SLE Micro 6.2 kernel-default-base 6.12.0-160000.6.1.160000.2.4 SUSE-SU-2025:21074-1
SLE Micro 6.2 kernel-livepatch-SLE16-RT_Update_0 4-160000.3.4 SUSE-SU-2026:20164-1
SLE Micro 6.2 kernel-livepatch-SLE16_Update_0 5-160000.4.3 SUSE-SU-2026:20169-1
SLE Micro 6.2 kernel-rt +5 6.12.0-160000.6.1 SUSE-SU-2026:20560-1, SUSE-SU-2025:21074-1
SLE Micro 6.1 kernel-default-base 6.4.0-34.1.21.11 SUSE-SU-2025:20669-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_10 9-1.1 SUSE-SU-2026:20397-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_4 14-1.1 SUSE-SU-2026:20400-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_5 13-1.1 SUSE-SU-2026:20392-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_7 11-1.3 SUSE-SU-2026:20394-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_9 9-1.2 SUSE-SU-2026:20396-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_4 15-1.2 SUSE-SU-2026:20390-1, SUSE-SU-2026:20376-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_5 13-1.2 SUSE-SU-2026:20391-1, SUSE-SU-2026:20377-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_6 +1 11-3.1 SUSE-SU-2026:20393-1, SUSE-SU-2026:20386-1, SUSE-SU-2026:20385-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_7 +3 10-1.2 SUSE-SU-2026:20395-1, SUSE-SU-2026:20389-1, SUSE-SU-2026:20388-1
SLE Micro 6.1 kernel-rt +1 6.4.0-36.1 SUSE-SU-2025:20756-1
SLE Micro 6.1 kernel-source +2 6.4.0-34.1 SUSE-SU-2025:20669-1
SLE Micro 6.0 kernel-default-base 6.4.0-34.1.21.11 SUSE-SU-2025:20653-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_10 9-1.1 SUSE-SU-2026:20253-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_4 14-1.1 SUSE-SU-2026:20265-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_5 13-1.1 SUSE-SU-2026:20248-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_7 11-1.3 SUSE-SU-2026:20250-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_9 9-1.2 SUSE-SU-2026:20252-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_4 15-1.2 SUSE-SU-2026:20275-1, SUSE-SU-2026:20255-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_5 13-1.2 SUSE-SU-2026:20276-1, SUSE-SU-2026:20256-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_6 +1 11-3.1 SUSE-SU-2026:20271-1, SUSE-SU-2026:20266-1, SUSE-SU-2026:20249-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_7 +3 10-1.2 SUSE-SU-2026:20274-1, SUSE-SU-2026:20273-1, SUSE-SU-2026:20272-1
SLE Micro 6.0 kernel-rt +1 6.4.0-36.1 SUSE-SU-2025:20739-1
SLE Micro 6.0 kernel-source +2 6.4.0-34.1 SUSE-SU-2025:20653-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.16.1 SUSE-SU-2025:03290-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_0 9-150700.3.1 SUSE-SU-2026:0148-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_4 1-150700.1.3.2 SUSE-SU-2025:03382-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_0 9-150700.3.24.1 SUSE-SU-2026:0283-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_1 +2 9-150700.2.1 SUSE-SU-2026:0284-1, SUSE-SU-2026:0171-1, SUSE-SU-2026:0144-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_4 1-150700.15.3.2 SUSE-SU-2025:03290-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.70.1 SUSE-SU-2025:03301-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_15 1-150600.1.3.1 SUSE-SU-2025:03272-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_10 11-150600.2.1 SUSE-SU-2026:0274-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_13 9-150600.2.1 SUSE-SU-2026:0283-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_15 1-150600.13.3.2 SUSE-SU-2025:03301-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_6 +1 17-150600.2.1 SUSE-SU-2026:0270-1, SUSE-SU-2026:0269-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_8 12-150600.2.1 SUSE-SU-2026:0262-1
SUSE Real Time Module 15 SP7 kernel-rt +2 6.4.0-150700.7.16.1 SUSE-SU-2025:03382-1
SUSE Real Time Module 15 SP6 kernel-rt +3 6.4.0-150600.10.52.1 SUSE-SU-2025:03272-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Leap 16.0 kernel-default-base 6.12.0-160000.6.1.160000.2.4 openSUSE-SU-2025:20081-1
openSUSE Leap 16.0 kernel-rt +10 6.12.0-160000.6.1 openSUSE-SU-2025:20081-1
openSUSE Leap 15.6 dtb-aarch64 +10 6.4.0-150600.23.70.1 SUSE-SU-2025:03301-1
openSUSE Leap 15.6 kernel-azure +2 6.4.0-150600.8.52.1 SUSE-SU-2025:03634-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.70.1.150600.12.30.2 SUSE-SU-2025:03301-1
openSUSE Leap 15.6 kernel-rt +3 6.4.0-150600.10.52.1 SUSE-SU-2025:03272-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.12.46-66.121 +1 1:1.0-0.amzn2023 ALAS2023-2025-1208, ALAS2023-2025-1169
Amazon Linux 2023 perf +14 1:6.1.148-173.267.amzn2023 ALAS2023-2025-1169
Amazon Linux 2023 perf6.12 +14 1:6.12.46-66.121.amzn2023 ALAS2023-2025-1208

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 9 kernel-uek +34 6.12.0-104.43.4.2.el10uek ELSA-2025-20662

Advisories 50

References