CVE-2026-99285: Linux kernel netfilter nft_byteorder multi-register bypass

CVE-2026-99285 · Severity: info · Published 2026-11-10

The Linux kernel's netfilter module contains a flaw in 64-bit byteorder conversion that affects packet filtering rules. An attacker could craft malicious network filtering rules to bypass intended network policies or cause unexpected behavior in packet processing, potentially allowing unauthorized traffic or denial of service on systems using affected filtering rules.

Technologies: Unknown Linux kernel. Vendors: Unknown.

Quick answers

Is CVE-2026-99285 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-99285 being exploited in the wild.
How severe is CVE-2026-99285?
Informational severity, published 10 November 2026.
Which products and versions are affected?
Unknown Linux kernel <UNKNOWN>.
Is there a fix for CVE-2026-99285?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-99285 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-99285?
Check whether you run Unknown Linux kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The nft_byteorder module incorrectly handles multi-register 64-bit byteorder conversion due to stepping by 4 bytes instead of 8 bytes through the source register array, causing out-of-bounds access and semantic breakage in byte order transformations. The vulnerability affects network packet filtering rules (nftables) that perform byteorder conversions across multiple registers, particularly in concatenated field rules. A fix removes the broken multi-register support entirely, requiring userspace nftables before version 1.1.0 to be upgraded to avoid rule loading failures.

Affected products

  • <UNKNOWN> Linux kernel <UNKNOWN>

Timeline

  • 2026-11-10: disclosed

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