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CVE-2026-98322

Linux: netfilter: nft_nat: fully initialise new_addr in netmap setup

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in29365695842db0a97b701a43a09fad1b4f7ecf3eAlso 7b9380c38c2fd2189416fa602bdbc5c8523b84b2, 161f5860c92a8ec80b6bdff16e79d70dcd8afc5a and 2 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 29365695842db0a97b701a43a09fad1b4f7ecf3eLinuxCVE List
  • 7b9380c38c2fd2189416fa602bdbc5c8523b84b2LinuxCVE List
  • 161f5860c92a8ec80b6bdff16e79d70dcd8afc5aLinuxCVE List
  • 0ce42c7b84032335abff9eac43762e4ca8224451LinuxCVE List
  • 1c43f5db482f74b41987c39c9c375a5e767556ebLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 18

  • Linuxaffected: 3ff7ddb1353da9b535e65702704cbadea1da9a00 before 29365695842db0a97b701a43a09fad1b4f7ecf3eCVE List
  • Linuxaffected: 3ff7ddb1353da9b535e65702704cbadea1da9a00 before 7b9380c38c2fd2189416fa602bdbc5c8523b84b2CVE List
  • Linuxaffected: 3ff7ddb1353da9b535e65702704cbadea1da9a00 before eb2030137dba3b59cbb5057a33af70488d6bc231CVE List
  • Linuxaffected: 3ff7ddb1353da9b535e65702704cbadea1da9a00 before e4982c489ee359162eee3ece1fb36082648464a5CVE List
  • Linuxaffected: 3ff7ddb1353da9b535e65702704cbadea1da9a00 before 161f5860c92a8ec80b6bdff16e79d70dcd8afc5aCVE List
  • Linuxaffected: 3ff7ddb1353da9b535e65702704cbadea1da9a00 before 0ce42c7b84032335abff9eac43762e4ca8224451CVE List
  • Linuxaffected: 3ff7ddb1353da9b535e65702704cbadea1da9a00 before 1c43f5db482f74b41987c39c9c375a5e767556ebCVE List
  • Linuxaffected: 3ff7ddb1353da9b535e65702704cbadea1da9a00 before d313499df66159b4b7971d760d16729598ab7e5aCVE List
  • Linuxaffected: 5.8CVE List
  • Linuxunaffected: all versions before 5.8CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8