What’s Vulnerable › Vulnerabilities

CVE-2026-98322: netfilter: nft_nat: fully initialise new_addr in netmap setup

• 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: nft_nat: fully initialise new_addr in netmap setup nft_nat_setup_netmap() builds the mapped address in an on-stack union nf_inet_addr. For an IPv4 mapping it writes only the 4-byte .ip member and the loop runs a single 32-bit iteration, but it then copies the whole 16-byte union into range->min_addr and range->max_addr, so the upper 12 bytes reach nf_nat_setup_info() uninitialised. KMSAN reports an uninit-value in nf_nat_setup_info() reached from nft_nat_eval(). The IPv6 path fills all 16 bytes and is not affected. Zero-initialise new_addr.

Affected products

• Linux kernel: 5.8 — 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/0ce42c7b84032335abff9eac43762e4ca8224451
• https://git.kernel.org/stable/c/161f5860c92a8ec80b6bdff16e79d70dcd8afc5a
• https://git.kernel.org/stable/c/1c43f5db482f74b41987c39c9c375a5e767556eb
• https://git.kernel.org/stable/c/29365695842db0a97b701a43a09fad1b4f7ecf3e
• https://git.kernel.org/stable/c/7b9380c38c2fd2189416fa602bdbc5c8523b84b2
• https://git.kernel.org/stable/c/d313499df66159b4b7971d760d16729598ab7e5a
• https://git.kernel.org/stable/c/e4982c489ee359162eee3ece1fb36082648464a5
• https://git.kernel.org/stable/c/eb2030137dba3b59cbb5057a33af70488d6bc231

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