VulnerabilityPublished 10 Nov 2026

CVE-2026-99285: Linux kernel · netfilter: nft_byteorder: remove multi-register support

Source GCVE Database

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Authoritative record:CVE-2026-99285· Medium

Not known to be exploited · fixed in dc29c0478b8564feb9371e715b5a0016eb8903fd : update Linux kernel when convenient.

Data as of 10 Nov 2026, 19:06 UTC

Severity

Medium

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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-vmhm-3cg3-fm3j

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=4.19.307 <4.20 >=5.4.269 <5.5 >=5.10.210 <5.11 >=5.15.140 <5.16 >=6.1.64 <6.2 >=6.5.13 <6.6 >=6.6.3 <6.7	Fixed in dc29c0478b8564feb9371e715b5a0016eb8903fd bb061d3de41707415269be75ebf700efb03ec212 6.7 6.6 6.2 5.16 5.11 5.5 4.20 3c5fb3a6c8118d15e60295e76fb5b879021eef43
LinuxLinux	Affected =6.7	Fixed in–

AI-suggested

A fix has been implemented by removing the multi-register support in nft_byteorder to prevent broken conversions. Users should upgrade nftables to version 1.1.0 or later to avoid incorrect byteorder conversions and ruleset loading failures. No additional mitigation is required beyond applying this update.

Description

A vulnerability in the Linux kernel's netfilter nft_byteorder feature involves broken 64-bit byteorder conversion when multiple registers are converted simultaneously. The issue arises because the source register array advances incorrectly in 4-byte steps instead of 8, causing dysfunctional multi-register byteorder conversions. The problematic multi-register support has been removed to simplify the code and avoid incorrect conversions. This affects nftables before version 1.1.0, which can generate incorrect byteorder conversions and cause affected rulesets to fail to load due to length mismatches.

Impact

Incorrect byteorder conversions in nftables can cause affected firewall rulesets to fail to load properly, potentially disrupting network filtering and security policies. This may lead to misconfiguration or failure of expected packet filtering behavior. There is no indication of direct exploitation or remote code execution. The impact is primarily on the correctness and reliability of firewall rule processing.

References

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