CVE-2026-98955 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, network administrators, and security teams responsible for Linux-based systems should assess exposure and prioritize patching to prevent potential issues with packet processing. They should verify the patches provided by the vendor and apply them to prevent potential issues with packet processing. Additionally, they should review system configurations and ensure proper packet handling to prevent potential issues.

Why it matters

The Linux kernel vulnerability in the flow dissector could lead to incorrect computation of the transport header offset, potentially causing issues with packet processing. Linux kernel developers and maintainers, network administrators, and security teams responsible for Linux-based systems should assess exposure and prioritize patching.

• Verify and apply patches to prevent potential issues with packet processing
• Monitor network traffic for anomalies that could indicate exploitation attempts
• Review system configurations and ensure proper packet handling

Technical summary

The flow dissector in the Linux kernel incorrectly computes the transport header offset due to a u16 truncation issue. This can cause problems with packet processing. The vulnerability is caused by the use of the min_t macro with a u16 type, which can lead to truncation of the skb->len value. This can result in an incorrect computation of the transport header offset. The incorrect thoff can cause packet processing issues, including misidentification of the transport header. Linux kernel developers and maintainers should assess the vulnerability and prioritize patching to prevent potential issues with packet processing.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided patches to the Linux kernel
• Monitor network traffic for potential issues with packet processing
• Consider implementing additional security measures to detect and prevent exploitation
• Verify the patches provided by the vendor and apply them to prevent potential issues with packet processing
• Review system configurations and ensure proper packet handling
• 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

The vulnerability is caused by the use of the min_t macro with a u16 type, which can lead to truncation of the skb->len value. This can result in an incorrect computation of the transport header offset. The Linux kernel developers and maintainers should verify the patches provided by the vendor and apply them to prevent potential issues with packet processing. The vulnerability affects Linux kernel versions and may impact network administrators and security teams responsible for Linux-based systems. To verify the patches, defenders

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.