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Vulnerability · Published Oct 18, 2026 · Assigned by Linux

CVE-2026-98568vxlan: use one headroom snapshot for neighbour replies

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 88.7% 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: vxlan: use one headroom snapshot for neighbour replies vxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then samples it again to reserve headroom. A concurrent vxlan_changelink() can update needed_headroom between the two reads, creating a TOCTOU race. The second value can exceed the allocation and make the Ethernet header write out of bounds. The race is reproducible on the unpatched kernel. It occurred when vxlan_na_create() generated a neighbour reply while vxlan_changelink() changed the link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte skbuff_small_head allocation. Snapshot the headroom once and use that value for both allocation and reservation.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-98568
Debian:13linux6.12.113-1DEBIAN-CVE-2026-98568
Debian:14linux7.2.9-1DEBIAN-CVE-2026-98568
Debian:12linux-6.126.12.113-1~deb12u1DEBIAN-CVE-2026-98568
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98568
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-98568
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-98568
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-98568

Affected products (as reported)

VendorProductVersions
Linux Linux 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa – before e3e24f4c434c56952412f875b834aa9daaa4fb154b29dba9c085a4fb79058fb1c45a2f6257ca3dfa – before 9ed5a548b42d46e6968a46b67ca8a8e49b12a5a14b29dba9c085a4fb79058fb1c45a2f6257ca3dfa – before fcaf456092dc86fd5b0b523ac27ec0d1140669314b29dba9c085a4fb79058fb1c45a2f6257ca3dfa – before 45a67662bf8ce3aa5643accf98d328dfbb47eaf64b29dba9c085a4fb79058fb1c45a2f6257ca3dfa – before 315d42ca39f69846662961c25dcf2bb07c350d144b29dba9c085a4fb79058fb1c45a2f6257ca3dfa – before a3c5eb6e382dd426a5e7eb08608897ed57167ff74b29dba9c085a4fb79058fb1c45a2f6257ca3dfa – before ff022fd9d0f0282c575e11778b96bd1b637503eb4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa – before 481506a756dcd828ef42391cb08f38d8d96d38fc
Linux Linux 3.14

References