CVE-2026-98322

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.

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