CVE-2026-98322

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux3ff7ddb1353da9b535e65702704cbadea1da9a00 < 29365695842db0a97b701a43a09fad1b4f7ecf3eaffected
LinuxLinux3ff7ddb1353da9b535e65702704cbadea1da9a00 < 7b9380c38c2fd2189416fa602bdbc5c8523b84b2affected
LinuxLinux3ff7ddb1353da9b535e65702704cbadea1da9a00 < eb2030137dba3b59cbb5057a33af70488d6bc231affected
LinuxLinux3ff7ddb1353da9b535e65702704cbadea1da9a00 < e4982c489ee359162eee3ece1fb36082648464a5affected
LinuxLinux3ff7ddb1353da9b535e65702704cbadea1da9a00 < 161f5860c92a8ec80b6bdff16e79d70dcd8afc5aaffected
LinuxLinux3ff7ddb1353da9b535e65702704cbadea1da9a00 < 0ce42c7b84032335abff9eac43762e4ca8224451affected
LinuxLinux3ff7ddb1353da9b535e65702704cbadea1da9a00 < 1c43f5db482f74b41987c39c9c375a5e767556ebaffected
LinuxLinux3ff7ddb1353da9b535e65702704cbadea1da9a00 < d313499df66159b4b7971d760d16729598ab7e5aaffected
LinuxLinux5.8affected
LinuxLinux0 < 5.8unaffected
LinuxLinux5.10.271 <= 5.10.*unaffected
LinuxLinux5.15.222 <= 5.15.*unaffected
LinuxLinux6.1.189 <= 6.1.*unaffected
LinuxLinux6.6.158 <= 6.6.*unaffected
LinuxLinux6.12.112 <= 6.12.*unaffected
LinuxLinux6.18.54 <= 6.18.*unaffected
LinuxLinux7.2.8 <= 7.2.*unaffected
LinuxLinux7.3-rc4 <= *unaffected

Weaknesses

References