In the Linux kernel, the following vulnerability has been resolved:
ipv6: annotate data-race in ndisc_router_discovery()
syzbot found that ndisc_router_discovery() could read and write in6_dev->ra_mtu without holding a lock [1]
This looks fine, IFLA_INET6_RA_MTU is best effort.
Add READ_ONCE()/WRITE_ONCE() to document the race.
Note that we might also reject illegal MTU values (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) in a future patch.
[1] BUG: KCSAN: data-race in ndisc_router_discovery / ndisc_router_discovery
read to 0xffff888119809c20 of 4 bytes by task 25817 on cpu 1: ndisc_router_discovery+0x151d/0x1c90 net/ipv6/ndisc.c:1558 ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841 icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989 ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438 ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489 NF_HOOK include/linux/netfilter.h:318 [inline] ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500 ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590 dst_input include/net/dst.h:474 [inline] ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79 ...
write to 0xffff888119809c20 of 4 bytes by task 25816 on cpu 0: ndisc_router_discovery+0x155a/0x1c90 net/ipv6/ndisc.c:1559 ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841 icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989 ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438 ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489 NF_HOOK include/linux/netfilter.h:318 [inline] ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500 ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590 dst_input include/net/dst.h:474 [inline] ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79 ...
value changed: 0x00000000 -> 0xe5400659
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-tools-develUpgrade kernel-toolsUpgrade perfUpgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade kernel-develUpgrade kernel-headersUpgrade bpftoolUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade python-perfUpgrade kernel-livepatch-5.15.201-140.219 | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade perf6.12Upgrade kernel-debuginfo-common-x86_64Upgrade kernel6.12-modules-extraUpgrade kernel-modules-extra-commonUpgrade kernel-libbpf-develUpgrade perf-debuginfoUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-libbpf-debuginfoUpgrade bpftool-debuginfoUpgrade bpftool6.12Upgrade kernel-libbpf-staticUpgrade kernel6.12-headersUpgrade kernel6.12-modules-extra-commonUpgrade kernel-headersUpgrade kernel6.12-debuginfoUpgrade kernel6.12-libbpf-develUpgrade kernel6.12-libbpf-staticUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-libbpfUpgrade kernel-toolsUpgrade kernelUpgrade kernel-livepatch-6.1.163-186.299Upgrade kernel-livepatch-6.12.68-92.122Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel-libbpf-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernel-modules-extraUpgrade kernel-debuginfoUpgrade kernel6.12-tools-develUpgrade python3-perf6.12Upgrade kernel6.12-toolsUpgrade kernel-develUpgrade kernel6.12-develUpgrade python3-perfUpgrade kernel-tools-develUpgrade kernel-libbpfUpgrade perf6.12-debuginfoUpgrade perfUpgrade kernel-tools-debuginfoUpgrade kernel6.12Upgrade kernel-debuginfo-common-aarch64Upgrade kernel6.12-debuginfo-common-x86_64 | Mar 9, 2026 | Feb 14, 2026 |
| Debian | — | Upgrade linux | Feb 16, 2026 | Feb 16, 2026 |
| Oracle_linux | — | Upgrade kernel-uek | Mar 13, 2026 | Feb 14, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Feb 14, 2026 |
| Ubuntu | — | Upgrade linux-image-gke-64k-6.8Upgrade linux-image-azure-fips-6.8Upgrade linux-image-generic-64k-6.8Upgrade linux-image-virtual-hwe-20.04Upgrade linux-image-gcp-64k-6.17Upgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-aws-6.8Upgrade linux-image-generic-6.8Upgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-gkeopUpgrade linux-image-6.8.0-1024-nvidia-tegra-rtUpgrade linux-image-aws-fipsUpgrade linux-image-oem-20.04cUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-oracle-5.15Upgrade linux-image-fipsUpgrade linux-image-generic-5.15Upgrade linux-image-nvidia-hwe-24.04Upgrade linux-image-5.15.0-1105-gcp-fipsUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1058-gcpUpgrade linux-image-oem-20.04dUpgrade linux-image-5.15.0-1100-nvidia-lowlatencyUpgrade linux-image-azureUpgrade linux-image-generic-lpaeUpgrade linux-image-virtual-6.8Upgrade linux-image-oem-20.04bUpgrade linux-image-lowlatencyUpgrade linux-image-gcp-fipsUpgrade linux-image-gke-5.15Upgrade linux-image-ibm-6.8Upgrade linux-image-gcp-fips-5.15Upgrade linux-image-6.8.0-1055-aws-64kUpgrade linux-image-6.8.0-117-lowlatencyUpgrade linux-image-6.8.0-1058-gcp-64kUpgrade linux-image-azure-5.15Upgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-nvidia-tegra-rt-5.15Upgrade linux-image-azure-fipsUpgrade linux-image-5.15.0-1070-xilinx-zynqmpUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-lowlatency-6.8Upgrade linux-image-6.8.0-117-lowlatency-64kUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.0-1054-gkeUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-nvidia-tegra-5.15Upgrade linux-image-5.15.0-1097-kvmUpgrade linux-image-6.17.0-1021-gcp-64kUpgrade linux-image-6.8.0-1032-xilinxUpgrade linux-image-nvidiaUpgrade linux-image-nvidia-5.15Upgrade linux-image-ibmUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-fips-6.8Upgrade linux-image-6.17.0-1031-nvidia-64kUpgrade linux-image-intelUpgrade linux-image-nvidia-lowlatency-5.15Upgrade linux-image-intel-iot-realtime-5.15Upgrade linux-image-6.8.0-1054-nvidiaUpgrade linux-image-gkeop-6.8Upgrade linux-image-raspiUpgrade linux-image-6.8.0-117-genericUpgrade linux-image-6.8.0-1054-nvidia-lowlatencyUpgrade linux-image-5.15.0-175-lowlatencyUpgrade linux-image-oracle-64k-6.17Upgrade linux-image-realtime-5.15Upgrade linux-image-aws-lts-22.04Upgrade linux-image-5.15.0-1088-gkeopUpgrade linux-image-kvm-5.15Upgrade linux-image-5.15.0-1110-azure-fipsUpgrade linux-image-6.8.0-1056-raspiUpgrade linux-image-gke-64kUpgrade linux-image-5.15.0-1102-oracleUpgrade linux-image-generic-64kUpgrade linux-image-xilinx-6.8Upgrade linux-image-genericUpgrade linux-image-azure-6.17Upgrade linux-image-realtime-6.8.1Upgrade linux-image-raspi-6.8Upgrade linux-image-6.17.0-1031-nvidiaUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-nvidia-tegraUpgrade linux-image-azure-lts-24.04Upgrade linux-image-nvidia-tegra-igx-rt-5.15Upgrade linux-image-raspi-5.15Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-6.8.0-1058-gcp-fipsUpgrade linux-image-ibm-classicUpgrade linux-image-intel-iotg-5.15Upgrade linux-image-realtime-6.17Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1054-nvidia-lowlatency-64kUpgrade linux-image-nvidia-64kUpgrade linux-image-5.15.0-1057-nvidia-tegra-rtUpgrade linux-image-6.17.0-1021-azureUpgrade linux-image-5.15.0-1106-gcpUpgrade linux-image-azure-lts-22.04Upgrade linux-image-gcp-64kUpgrade linux-image-generic-64k-5.15Upgrade linux-image-gke-6.8Upgrade linux-image-6.17.0-1030-oemUpgrade linux-image-azure-fde-6.17Upgrade linux-image-5.15.0-176-generic-64kUpgrade linux-image-5.15.0-1105-awsUpgrade linux-image-5.15.0-1046-nvidia-tegra-igx-rtUpgrade linux-image-raspi-realtimeUpgrade linux-image-nvidia-6.17Upgrade linux-image-ibm-5.15Upgrade linux-image-aws-64k-5.15Upgrade linux-image-5.15.0-1105-aws-64kUpgrade linux-image-5.15.0-1046-nvidia-tegra-igxUpgrade linux-image-aws-fips-6.8Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-5.15.0-175-lowlatency-64kUpgrade linux-image-nvidia-tegra-igx-5.15Upgrade linux-image-kvmUpgrade linux-image-azure-cvmUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-aws-64k-lts-22.04Upgrade linux-image-awsUpgrade linux-image-6.17.0-1021-gcpUpgrade linux-image-6.8.0-1024-nvidia-tegraUpgrade linux-image-oracle-64kUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-nvidia-tegra-igx-rtUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-5.15.0-1057-nvidia-tegraUpgrade linux-image-oracle-6.17Upgrade linux-image-5.15.0-1100-intel-iotgUpgrade linux-image-6.8.0-1059-azure-fipsUpgrade linux-image-intel-iotgUpgrade linux-image-xilinxUpgrade linux-image-5.15.0-176-generic-lpaeUpgrade linux-image-6.8.0-1055-aws-fipsUpgrade linux-image-5.15.0-1105-gcpUpgrade linux-image-6.8.0-1041-gkeopUpgrade linux-image-gkeUpgrade linux-image-azure-fips-5.15Upgrade linux-image-6.8.0-1055-awsUpgrade linux-image-oem-6.17Upgrade linux-image-lowlatency-5.15Upgrade linux-image-azure-6.8Upgrade linux-image-virtualUpgrade linux-image-realtimeUpgrade linux-image-raspi-nolpaeUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-lowlatency-64k-5.15Upgrade linux-image-gcp-lts-22.04Upgrade linux-image-6.8.0-116-fipsUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-virtual-5.15Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-6.8.0-1059-azureUpgrade linux-image-6.8.0-1056-azureUpgrade linux-image-6.8.0-1054-gke-64kUpgrade linux-image-5.15.0-176-genericUpgrade linux-image-5.15.0-1104-realtimeUpgrade linux-image-5.15.0-1099-raspiUpgrade linux-image-oem-24.04cUpgrade linux-image-oem-24.04aUpgrade linux-image-oem-20.04Upgrade linux-image-nvidia-64k-6.8Upgrade linux-image-nvidia-64k-6.17Upgrade linux-image-nvidia-6.8Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-generic-lpae-5.15Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-aws-5.15Upgrade linux-image-aws-lts-24.04Upgrade linux-image-6.17.0-1018-realtimeUpgrade linux-image-gcp-64k-6.8Upgrade linux-image-gcpUpgrade linux-image-gcp-5.15Upgrade linux-image-6.8.0-2045-raspi-realtimeUpgrade linux-image-gcp-6.17Upgrade linux-image-nvidia-64k-hwe-24.04Upgrade linux-image-5.15.0-1110-azureUpgrade linux-image-6.8.1-1051-realtimeUpgrade linux-image-6.8.0-1055-ibmUpgrade linux-image-5.15.0-176-fipsUpgrade linux-image-5.15.0-1101-gkeUpgrade linux-image-5.15.0-1099-ibmUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-oem-24.04dUpgrade linux-image-oem-24.04Upgrade linux-image-6.17.0-1019-oracle-64kUpgrade linux-image-6.8.0-117-generic-64kUpgrade linux-image-gkeop-5.15Upgrade linux-image-fips-5.15Upgrade linux-image-6.17.0-1019-oracleUpgrade linux-image-xilinx-zynqmp-5.15Upgrade linux-image-gcp-6.8Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-nvidia-tegra-igxUpgrade linux-image-6.8.0-1054-nvidia-64kUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-oem-24.04bUpgrade linux-image-5.15.0-1097-intel-iot-realtimeUpgrade linux-image-6.17.0-1018-azure-fdeUpgrade linux-image-oracleUpgrade linux-image-5.15.0-1100-nvidia | Apr 10, 2026 | Feb 14, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Feb 14, 2026 |
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