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Vulnerability · Published Oct 23, 2026 · Assigned by Linux

CVE-2026-99071ipv4: do not warn on route notification size race

Unrated

In plain English

A security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 89.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: ipv4: do not warn on route notification size race Commit 680aea08e78c ("net: ipv4: Emit notification when fib hardware flags are changed") added asynchronous route notifications for hardware flag changes. fib_alias_hw_flags_set() sizes the skb with fib_nlmsg_size() and later fills it with fib_dump_info() while holding only RCU. With nexthop compatibility mode enabled, a concurrent replacement can grow the group between these independent snapshots. fib_dump_info() can then legitimately return -EMSGSIZE, so the warning does not prove a sizing bug. Remove the warning. The existing error path still frees the skb and reports the error to listeners.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-99071
Debian:13linux6.12.113-1DEBIAN-CVE-2026-99071
Debian:14linux7.2.11-1DEBIAN-CVE-2026-99071
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinuxno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.10linux7.3.0-10.10UBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.10linux-aws7.3.0-1004.4UBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.10linux-azureno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.10linux-gcp7.3.0-1004.4UBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-hwe-7.0no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-oem-7.0no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.10linux-oracle7.3.0-1004.4UBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.10linux-raspi7.3.0-1004.4UBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.10linux-realtime7.3.0-10.10.1UBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-99071
Ubuntu:26.10linux-riscv7.3.0-10.10.1UBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-riscv-7.0no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-99071
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-99071
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-99071

Affected products (as reported)

VendorProductVersions
Linux Linux 680aea08e78c003292415518ad270bc20f9c80b1 – before 8b35e7767fdee63e57948a1ec89d9238a651f8c6680aea08e78c003292415518ad270bc20f9c80b1 – before 096ad0cb77f8da1928d04a0d170535e14ca6311b680aea08e78c003292415518ad270bc20f9c80b1 – before 088ba80eef85fa7a5ad8f9e7c82b403c99242b56680aea08e78c003292415518ad270bc20f9c80b1 – before 78a1cf5c54b2f795c81fedb530755a8d01cc84f0680aea08e78c003292415518ad270bc20f9c80b1 – before 7dfa7ca97f3ac46353edd4cc44f7733758e4535b680aea08e78c003292415518ad270bc20f9c80b1 – before 221ef5e1e44a044790f0f54e6aa237883f475a4d680aea08e78c003292415518ad270bc20f9c80b1 – before e02a5b6588161673ef75a4bc5cdfb62bd493374d
Linux Linux 5.12

References