In the Linux kernel, the following vulnerability has been resolved:
ipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops
fib_nlmsg_size() still estimates nexthop space as if every gateway is encoded as an IPv4 RTA_GATEWAY attribute. IPv4 routes can also carry an IPv6 gateway, which fib_nexthop_info() dumps as RTA_VIA.
As a result, route notifications can allocate an skb that is too small. fib_dump_info() then fails with -EMSGSIZE and rtmsg_fib() hits the WARN_ON() that marks such failures as a fib_nlmsg_size() bug. With panic_on_warn set, this becomes a kernel panic.
Mirror the actual nexthop dump layout in fib_nlmsg_size(): account for IPv6 nexthop gateways dumped as RTA_VIA, for the no-header rtnexthop layout used inside RTA_MULTIPATH, and for RTA_FLOW only when it is actually present.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade python3-perf6.18Upgrade python3-perf6.18-debuginfoUpgrade kernel6.18-tools-develUpgrade kernel6.18-toolsUpgrade microvm-kernel6.18Upgrade perf6.18-debuginfoUpgrade kernel6.18-modules-extraUpgrade bpftool6.18Upgrade bpftool6.18-debuginfoUpgrade perf6.18Upgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-develUpgrade kernel6.18Upgrade kernel6.18-headersUpgrade kernel6.18-modules-extra-commonUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel-livepatch-6.18.48-107.148Upgrade kernel6.18-debuginfo | Sep 30, 2026 | Aug 22, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Aug 26, 2026 | Aug 26, 2026 |
| Redhat_linux | — | No solution exists | Aug 26, 2026 | Aug 22, 2026 |
| Ubuntu | — | Upgrade linux-image-5.15.0-1100-gkeopUpgrade linux-image-oem-20.04bUpgrade linux-image-gkeopUpgrade linux-image-fips-5.15Upgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-azure-fipsUpgrade linux-image-gcpUpgrade linux-image-5.15.0-1117-awsUpgrade linux-image-5.15.0-1113-gkeUpgrade linux-image-ibmUpgrade linux-image-virtualUpgrade linux-image-intel-iot-realtime-5.15Upgrade linux-image-intelUpgrade linux-image-gcp-fipsUpgrade linux-image-5.15.0-1112-intel-iotgUpgrade linux-image-intel-iotg-5.15Upgrade linux-image-kvm-5.15Upgrade linux-image-lowlatencyUpgrade linux-image-5.15.0-1123-azure-fipsUpgrade linux-image-generic-64kUpgrade linux-image-5.15.0-1109-intel-iot-realtimeUpgrade linux-image-fipsUpgrade linux-image-azure-lts-22.04Upgrade linux-image-5.15.0-1118-gcp-fipsUpgrade linux-image-aws-64k-5.15Upgrade linux-image-generic-lpaeUpgrade linux-image-5.15.0-198-generic-64kUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-aws-lts-22.04Upgrade linux-image-azure-fdeUpgrade linux-image-oem-20.04dUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-oem-20.04cUpgrade linux-image-generic-5.15Upgrade linux-image-azureUpgrade linux-image-aws-fipsUpgrade linux-image-5.15.0-1123-azureUpgrade linux-image-5.15.0-1117-aws-fipsUpgrade linux-image-realtime-5.15Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-virtual-5.15Upgrade linux-image-lowlatency-64k-5.15Upgrade linux-image-ibm-5.15Upgrade linux-image-generic-lpae-5.15Upgrade linux-image-azure-fde-5.15Upgrade linux-image-azure-cvmUpgrade linux-image-5.15.0-1116-realtimeUpgrade linux-image-lowlatency-5.15Upgrade linux-image-azure-fips-5.15Upgrade linux-image-5.15.0-1118-gcpUpgrade linux-image-intel-iotgUpgrade linux-image-5.15.0-1111-ibmUpgrade linux-image-oem-20.04Upgrade linux-image-5.15.0-198-genericUpgrade linux-image-5.15.0-195-lowlatencyUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-azure-5.15Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-aws-5.15Upgrade linux-image-5.15.0-1109-kvmUpgrade linux-image-oracleUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-aws-fips-5.15Upgrade linux-image-kvmUpgrade linux-image-gkeUpgrade linux-image-xilinx-zynqmp-5.15Upgrade linux-image-oracle-lts-22.04Upgrade linux-image-oracle-5.15Upgrade linux-image-5.15.0-1122-azure-fdeUpgrade linux-image-5.15.0-1080-xilinx-zynqmpUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-gcp-5.15Upgrade linux-image-awsUpgrade linux-image-5.15.0-198-generic-lpaeUpgrade linux-image-5.15.0-198-fipsUpgrade linux-image-generic-64k-5.15Upgrade linux-image-gcp-fips-5.15Upgrade linux-image-realtimeUpgrade linux-image-5.15.0-1117-aws-64kUpgrade linux-image-gkeop-5.15 | Oct 6, 2026 | Oct 6, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 15, 2026 | Aug 22, 2026 |
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