CVE-2026-43028 Linux CVE debrief

Who should care

Users of Linux kernel versions 4.5 to 6.19.12, and 7.0 rc1 to rc6 should review their systems for potential exposure. System administrators and security teams responsible for Linux kernel-based systems should prioritize applying patches from Linux kernel stable branches.

Technical summary

The Linux kernel's netfilter: x_tables component did not properly validate names, leading to a potential vulnerability. The issue arises from the lack of nul-termination in names before they are used by functions expecting c-strings. This has been fixed in various kernel versions through a series of patches. Specifically, the vulnerability was addressed by adding checks to ensure names are properly terminated before use.

Defensive priority

High priority should be given to applying patches for this vulnerability, especially for systems running Linux kernel versions 4.5 to 6.19.12, and 7.0 rc1 to rc6. System administrators and security teams should prioritize patching and review compensating controls for exposed systems.

Recommended defensive actions

• Apply patches from Linux kernel stable branches
• Review and update Linux kernel versions to ensure nul-termination of names in netfilter: x_tables
• Monitor systems for unusual activity related to netfilter: x_tables
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

Evidence from official CVE and NVD records indicate a patched vulnerability in the Linux kernel's netfilter: x_tables component. Multiple references to patches are provided. The vulnerability arises from the lack of nul-termination in names before they are used by functions expecting c-strings. This has been fixed in various kernel versions. Users should verify their systems for potential exposure and review patches from Linux kernel stable branches.

Official resources