CVE-2026-98822 Linux CVE debrief

Who should care

Linux kernel maintainers, network administrators, and security teams responsible for managing Linux-based systems, especially those using mac80211, should assess exposure and apply patches or compensating controls as needed.

Why it matters

This vulnerability in the Linux kernel's mac80211 could allow unauthorized transmission of unicast frames, potentially leading to security issues. Linux kernel maintainers, network administrators, and security teams should assess exposure and apply patches or compensating controls as needed.

• Verify network segmentation and VLAN configurations to prevent unauthorized transmission of frames.
• Assess the risk of potential frame transmission to unintended stations on the same BSS.
• Review Linux kernel versions and apply patches to prevent exploitation.

Technical summary

The Linux kernel's mac80211 has a vulnerability that allows unicast frames sent on one interface to match a station of a different VLAN of the same BSS and be transmitted to it. The fix prevents AP VLAN tx from other interfaces, except for control port frames, enhancing security and preventing unintended frame transmission. This vulnerability could allow unauthorized transmission of unicast frames, potentially leading to security issues. The fix ensures that only control port frames can be sent for VLAN stations directly on the BSS interface.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patches provided by the Linux kernel maintainers.
• Verify the integrity of the Linux kernel versions in use.
• Monitor network traffic for suspicious activity.
• Verify network segmentation and VLAN configurations to prevent unauthorized transmission of frames.
• Assess the risk of potential frame transmission to unintended stations on the same BSS.
• Review Linux kernel versions and apply patches to prevent exploitation.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected versions. However, the CVSS score and severity are not provided. The source item and CVE record offer limited information on the vulnerability, with no explicit details on the patch or affected Linux kernel versions. The debrief and technical summary provide additional context on the vulnerability and its implications. Defenders should verify Linux kernel versions, assess network segmentation, and review VLAN configurations to

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.