What’s Vulnerable › Vulnerabilities

CVE-2026-43454: netfilter: nf_tables: Fix for duplicate device in netdev hooks

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: Fix for duplicate device in netdev hooks When handling NETDEV_REGISTER notification, duplicate device registration must be avoided since the device may have been added by nft_netdev_hook_alloc() already when creating the hook.

Affected products

• Linux kernel: from 6.16 before 6.18.19; from 6.19 before 6.19.9; 7.0-rc1, 7.0-rc2, 7.0-rc3 — fixed in 6.18.19, 6.19.9

How to fix

Upgrade to a fixed version: Linux kernel 6.18.19, 6.19.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2041cdb078041611510fc189410bc70b29f688fb
• https://git.kernel.org/stable/c/6d2a95c6890577cc3eab2b20018e16850d7fb094
• https://git.kernel.org/stable/c/b7cdc5a97d02c943f4bdde4d5767ad0c13cad92b

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