In the Linux kernel, the following vulnerability has been resolved:
ipv6: release nexthop on device removal
The CI is hitting some aperiodic hangup at device removal time in the pmtu.sh self-test:
unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6 ref_tracker: veth_A-R1@ffff888013df15d8 has 1/5 users at dst_init+0x84/0x4a0 dst_alloc+0x97/0x150 ip6_dst_alloc+0x23/0x90 ip6_rt_pcpu_alloc+0x1e6/0x520 ip6_pol_route+0x56f/0x840 fib6_rule_lookup+0x334/0x630 ip6_route_output_flags+0x259/0x480 ip6_dst_lookup_tail.constprop.0+0x5c2/0x940 ip6_dst_lookup_flow+0x88/0x190 udp_tunnel6_dst_lookup+0x2a7/0x4c0 vxlan_xmit_one+0xbde/0x4a50 [vxlan] vxlan_xmit+0x9ad/0xf20 [vxlan] dev_hard_start_xmit+0x10e/0x360 __dev_queue_xmit+0xf95/0x18c0 arp_solicit+0x4a2/0xe00 neigh_probe+0xaa/0xf0
While the first suspect is the dst_cache, explicitly tracking the dst owing the last device reference via probes proved such dst is held by the nexthop in the originating fib6_info.
Similar to commit f5b51fe804ec ("ipv6: route: purge exception on removal"), we need to explicitly release the originating fib info when disconnecting a to-be-removed device from a live ipv6 dst: move the fib6_info cleanup into ip6_dst_ifdown().
Tested running:
./pmtu.sh cleanup_ipv6_exception
in a tight loop for more than 400 iterations with no spat, running an unpatched kernel I observed a splat every ~10 iterations.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfoUpgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-headersUpgrade kernel-tools-debuginfoUpgrade perf-debuginfoUpgrade perfUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernel-livepatch-5.15.184-125.190Upgrade kernel-develUpgrade kernel-toolsUpgrade python-perfUpgrade kernel-debuginfo-common-aarch64 | May 30, 2025 | Dec 29, 2024 |
| Amazon_linux_2023 | — | Upgrade kernelUpgrade kernel-toolsUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfo-common-aarch64Upgrade bpftool-debuginfoUpgrade kernel-libbpf-develUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernel-modules-extra-commonUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernel-libbpf-staticUpgrade kernel-modules-extraUpgrade kernel-livepatch-6.1.124-134.200Upgrade kernel-headersUpgrade kernel-libbpfUpgrade perf-debuginfoUpgrade kernel-debuginfoUpgrade python3-perfUpgrade kernel-tools-develUpgrade perf | Feb 17, 2025 | Dec 29, 2024 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Jan 13, 2025 | Dec 29, 2024 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernel-toolsUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade python3-perf | Apr 11, 2025 | Dec 29, 2024 |
| Huawei Euleros 2_0_sp12 | — | Upgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-toolsUpgrade python3-perfUpgrade kernel-tools-libs | Mar 19, 2025 | Dec 29, 2024 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernelUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade python3-perfUpgrade bpftool | Apr 1, 2025 | Dec 29, 2024 |
| Oracle_linux | — | Upgrade kernel-uek | Jul 17, 2025 | Dec 29, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Dec 29, 2024 |
| Ubuntu | — | Upgrade linux-image-5.15.0-1070-gkeopUpgrade linux-image-6.8.0-1027-azure-fdeUpgrade linux-image-gkeop-5.15Upgrade linux-image-5.15.0-1082-nvidia-lowlatencyUpgrade linux-image-lowlatency-64k-5.15Upgrade linux-image-fips-5.15Upgrade linux-image-6.8.0-1026-oemUpgrade linux-image-6.8.0-58-lowlatency-64kUpgrade linux-image-5.15.0-1088-aws-fipsUpgrade linux-image-oem-22.04dUpgrade linux-image-aws-lts-24.04Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.8.0-1027-awsUpgrade linux-image-virtual-5.15Upgrade linux-image-virtualUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-kvmUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-aws-lts-22.04Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-aws-5.15Upgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-raspi-nolpaeUpgrade linux-image-realtime-5.15Upgrade linux-image-6.8.0-58-generic-64kUpgrade linux-image-gcp-64kUpgrade linux-image-azure-5.15Upgrade linux-image-gcpUpgrade linux-image-oem-20.04dUpgrade linux-image-6.8.0-1023-gkeUpgrade linux-image-5.15.0-144-fipsUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-nvidia-64kUpgrade linux-image-oracle-64kUpgrade linux-image-5.15.0-1088-realtimeUpgrade linux-image-oem-22.04bUpgrade linux-image-xilinx-zynqmp-5.15Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-5.15.0-1087-gcpUpgrade linux-image-5.15.0-1083-intel-iotgUpgrade linux-image-nvidia-tegra-igx-rtUpgrade linux-image-aws-64k-5.15Upgrade linux-image-azure-lts-24.04Upgrade linux-image-azure-fipsUpgrade linux-image-awsUpgrade linux-image-raspi-realtimeUpgrade linux-image-5.15.0-1085-gkeUpgrade linux-image-azure-fdeUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-6.8.0-1028-gcp-64kUpgrade linux-image-gcp-fipsUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-intel-iot-realtime-5.15Upgrade linux-image-6.8.0-1024-oracle-64kUpgrade linux-image-5.15.0-1041-nvidia-tegra-rtUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-ibm-classicUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.8.0-1010-gkeopUpgrade linux-image-gcp-5.15Upgrade linux-image-6.8.0-1014-azure-nvidiaUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-6.8.0-1024-ibmUpgrade linux-image-nvidia-tegra-igxUpgrade linux-image-realtimeUpgrade linux-image-oracleUpgrade linux-image-azure-cvmUpgrade linux-image-5.15.0-144-generic-64kUpgrade linux-image-raspi-5.15Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-oem-24.04aUpgrade linux-image-6.8.0-1028-raspiUpgrade linux-image-5.15.0-1094-azure-fipsUpgrade linux-image-5.15.0-1084-kvmUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-6.8.0-58-genericUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-5.15.0-144-generic-lpaeUpgrade linux-image-oem-24.04bUpgrade linux-image-nvidiaUpgrade linux-image-nvidia-tegra-rt-5.15Upgrade linux-image-generic-lpaeUpgrade linux-image-generic-64kUpgrade linux-image-aws-fips-5.15Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-gkeUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1024-oracleUpgrade linux-image-nvidia-tegra-igx-rt-5.15Upgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-aws-fipsUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-5.15.0-1087-gcp-fipsUpgrade linux-image-5.15.0-144-genericUpgrade linux-image-azure-lts-22.04Upgrade linux-image-oem-20.04cUpgrade linux-image-ibmUpgrade linux-image-azureUpgrade linux-image-6.8.0-1026-nvidia-64kUpgrade linux-image-6.8.0-1026-nvidia-lowlatencyUpgrade linux-image-oem-20.04Upgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-5.15.0-1083-raspiUpgrade linux-image-5.15.0-1030-nvidia-tegra-igx-rtUpgrade linux-image-nvidia-tegraUpgrade linux-image-6.8.0-1026-nvidia-lowlatency-64kUpgrade linux-image-6.11.0-1009-azureUpgrade linux-image-nvidia-6.8Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-oem-22.04aUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-5.15.0-1081-intel-iot-realtimeUpgrade linux-image-5.15.0-144-lowlatencyUpgrade linux-image-intel-iotgUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-intel-iotg-5.15Upgrade linux-image-5.15.0-1041-nvidia-tegraUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-5.15.0-1088-aws-64kUpgrade linux-image-oem-22.04Upgrade linux-image-lowlatency-5.15Upgrade linux-image-5.15.0-1052-xilinx-zynqmpUpgrade linux-image-gkeopUpgrade linux-image-azure-nvidiaUpgrade linux-image-fipsUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-nvidia-5.15Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-nvidia-tegra-5.15Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-6.8.0-1028-gcpUpgrade linux-image-5.15.0-144-lowlatency-64kUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-6.11.0-1015-oemUpgrade linux-image-nvidia-lowlatency-5.15Upgrade linux-image-ibm-5.15Upgrade linux-image-5.15.0-1082-nvidiaUpgrade linux-image-gke-5.15Upgrade linux-image-oracle-5.15Upgrade linux-image-genericUpgrade linux-image-gcp-fips-5.15Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-kvm-5.15Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-oem-20.04bUpgrade linux-image-raspiUpgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-1026-nvidiaUpgrade linux-image-nvidia-tegra-igx-5.15Upgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-gkeop-6.8Upgrade linux-image-5.15.0-1080-ibmUpgrade linux-image-generic-lpae-5.15Upgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-5.15.0-1030-nvidia-tegra-igxUpgrade linux-image-aws-64k-lts-22.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.8.0-1027-azureUpgrade linux-image-6.8.0-2023-raspi-realtimeUpgrade linux-image-oem-22.04cUpgrade linux-image-oem-24.04Upgrade linux-image-generic-5.15Upgrade linux-image-5.15.0-1088-awsUpgrade linux-image-intelUpgrade linux-image-5.15.0-1085-oracleUpgrade linux-image-generic-64k-5.15Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-5.15.0-1094-azureUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-6.8.1-1020-realtimeUpgrade linux-image-6.8.0-58-lowlatencyUpgrade linux-image-azure-fips-5.15 | Feb 20, 2025 | Dec 29, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 29, 2025 | Dec 29, 2024 |
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