CVE-2026-98700 Linux CVE debrief

Who should care

Defenders managing Linux kernel environments, especially those with wireless network configurations, should assess exposure and verify patch application. Priority should be given to reviewing channel context and MLD interface settings. Linux kernel operators, platform administrators, vulnerability management teams, and security teams should review and update Linux kernel versions to address this vulnerability.

Why it matters

Defenders should verify Linux kernel versions and assess exposure based on network configurations due to a vulnerability in mac80211 that has been addressed.

• Incorrect band information usage in ieee80211_get_tx_rates()
• Potential for dropped frames or incorrect rate selection
• Need for verification of channel context and MLD interface settings
• Priority on reviewing and updating Linux kernel versions

Technical summary

The Linux kernel's mac80211 has a vulnerability where the info->band for 802.3 encap offload frames was not set. This could lead to incorrect band usage in ieee80211_get_tx_rates(). The issue has been resolved by setting the band information similarly to ieee80211_build_hdr(). Without proper band setting, ieee80211_get_tx_rates() may use incorrect band information. The fix ensures band information is set  Defensive priority should be given to reviewing channel context and MLD interface settings. The vulnerability affects Linux kernel environments, especially those with wireless network configurations.

Defensive priority

Defenders should verify Linux kernel versions and assess exposure based on network configurations. Priority should be given to reviewing channel context and MLD interface settings.

Recommended defensive actions

• Review Linux kernel versions for patch presence and apply updates if necessary
• Assess network configurations for channel context and MLD interface settings
• Verify ieee80211_get_tx_rates() usage in the environment
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the Linux kernel vulnerability. References include kernel.org links for patch information. Defenders should verify Linux kernel versions and assess exposure based on network configurations. The fix ensures band information is set similarly to ieee80211_build_hdr(), either dropping the frame if no channel context exists or leaving the band at 0 for MLD interfaces. This vulnerability affects Linux kernel environments, especially those with wireless network configurations. To verify patch  

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.