CVE-2026-99285: Linux kernel · netfilter: nft_byteorder: remove multi-register support
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in dc29c0478b8564feb9371e715b5a0016eb8903fd : update Linux kernel when convenient.
Data as of 10 Nov 2026, 17:51 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in dc29c0478b8564feb9371e715b5a0016eb8903fd, bb061d3de41707415269be75ebf700efb03ec212, 6.7 +7
Exploitation evidence
Disclosed: evidence found.
CVE published 10 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 10 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available and has been applied in Linux kernel versions 6.7, 6.6, 6.2, 5.16, 5.11, 5.5, 4.20, and associated commits. Users should upgrade to these fixed versions to resolve the vulnerability. Userspaces relying on nftables should also be updated to versions compatible with the new byteorder semantics to avoid ruleset loading failures. No additional mitigation is required beyond applying the official fixes.
Description
A vulnerability in the Linux kernel's netfilter nft_byteorder feature involves broken 64-bit byteorder conversion when multiple registers are converted. The issue arises because the source register array advances in 4-byte steps instead of 8, causing incorrect conversions. The multi-register support feature is removed to resolve this and other related issues. This fix affects nftables behavior, particularly for rulesets using concatenated registers and byteorder conversions. The vulnerability is addressed in Linux kernel versions 6.7 and other specified fixed versions.