What’s Vulnerable › Vulnerabilities

CVE-2026-98321: netfilter: nf_nat: unregister and release hooks on error

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_nat: unregister and release hooks on error If nf_hook_entries_insert_raw() fails, the NAT hooks get never released, resulting in a memleak. Postpone setting nat_proto_net->nat_hook_ops when the hooks are registered to simplify the error path to decide whether the nat hooks need unwinding.

Affected products

• Linux kernel: 4.18 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/79084567cd082fb4482e1ea457580e7d6504dd99
• https://git.kernel.org/stable/c/cbdd39ce42530a193c56beb206a3356cb6d01016
• https://git.kernel.org/stable/c/df80342f4bfc023ad7d6703df5e27f583ff0cb8d

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