CVE-2026-64515 Linux CVE debrief

Who should care

Users of Linux kernel, Linux kernel developers, security teams, and operators of Linux-based systems should be aware of this vulnerability and take necessary actions to patch or mitigate it. This includes verifying system patch status, reviewing official advisories, and ensuring compensating controls are in place for exposed systems.

Technical summary

In the Linux kernel, a vulnerability was found in the wifi: mac80211 MLE defragmentation. If either reconf or EPCS multi-link element (MLE) is contained in a non-transmitted profile, the defragmentation routine is called with a pointer to the defragmented copy, but the original elements. This is incorrect for two reasons: if the original defragmentation was needed, it will not find the correct data; if the original frame is at a higher address, the parsing will potentially overrun the heap data. The vulnerability has been resolved.

Defensive priority

Medium

Recommended defensive actions

• Apply the patch
• Monitor for updates
• Review compensating controls
• Check relevant monitoring and detection logs
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments
• Review the supplied official advisory or CVE record

Evidence notes

The CVE record was published on 2026-07-25T10:17:37.763Z and has not been modified since then. The Linux kernel was vulnerable to a wifi: mac80211 MLE defragmentation issue. Evidence is limited to CVE and NVD details. Defenders should verify Linux kernel versions and patch status. Additional verification steps include reviewing official advisories and tracking potential exposure.

Official resources