CVE-2026-74746 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution vendors, and users of Linux systems that utilize the netfilter flowtable component should assess exposure and apply patches or updates as necessary.

Why it matters

A vulnerability in the Linux kernel's netfilter flowtable component requires attention from Linux kernel maintainers, Linux distribution vendors, and users of Linux systems. The vulnerability can lead to slab-use-after-free read and write reports, and its resolution involves publishing GC-visible tuples last to prevent partial flow installation.

• Potential for slab-use-after-free read and write reports in the flowtable/rhashtable path
• Need for verification of Linux kernel versions and application of patches or updates
• Monitoring system logs for signs of exploitation or vulnerability

Technical summary

The Linux kernel's netfilter flowtable component has a vulnerability that can lead to slab-use-after-free read and write reports. The issue is resolved by publishing GC-visible tuples last to prevent partial flow installation. The vulnerability affects Linux kernel versions and requires attention from Linux kernel maintainers, Linux distribution vendors, and users of Linux systems that utilize the netfilter flowtable component. The resolution involves publishing GC-visible tuples last to prevent partial flow installation and potential slab-use-after-free read and write reports in the flowtable/rhashtable path.

Defensive priority

High

Recommended defensive actions

• Review and apply the provided patches to the Linux kernel's netfilter flowtable component
• Verify the integrity of the Linux kernel versions and apply updates as necessary
• Monitor system logs for slab-use-after-free read and write reports in the flowtable/rhashtable path
• Perform a thorough review of system logs to identify potential exploitation attempts
• Conduct a comprehensive asset inventory to identify affected systems
• Implement compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions and retest remediated assets to ensure vulnerability resolution

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected versions. However, the corpus does not establish specific exploitation or impact details, requiring verification from official sources.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.