CVE-2026-98322: Linux kernel · netfilter: nft_nat: fully initialise new_addr in netmap setup
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:27 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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
- ubuntu.com/security/CVE-2026-98322 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98322 (opens in a new tab)
- git.kernel.org/linus/d313499df66159b4b7971d760d16729598ab7e5a (opens in a new tab)
- git.kernel.org/stable/c/0ce42c7b84032335abff9eac43762e4ca8224451 (opens in a new tab)
- git.kernel.org/stable/c/161f5860c92a8ec80b6bdff16e79d70dcd8afc5a (opens in a new tab)
- git.kernel.org/stable/c/1c43f5db482f74b41987c39c9c375a5e767556eb (opens in a new tab)
- git.kernel.org/stable/c/29365695842db0a97b701a43a09fad1b4f7ecf3e (opens in a new tab)
- git.kernel.org/stable/c/7b9380c38c2fd2189416fa602bdbc5c8523b84b2 (opens in a new tab)
- git.kernel.org/stable/c/d313499df66159b4b7971d760d16729598ab7e5a (opens in a new tab)
- git.kernel.org/stable/c/e4982c489ee359162eee3ece1fb36082648464a5 (opens in a new tab)
- git.kernel.org/stable/c/eb2030137dba3b59cbb5057a33af70488d6bc231 (opens in a new tab)