PatchSiren cyber security CVE debrief

CVE-2026-64515 Linux CVE debrief

The Linux kernel was vulnerable to a wifi: mac80211 MLE defragmentation issue. The vulnerability has been resolved. Affected products include Linux kernel deployments. The vulnerability class is related to wifi: mac80211 MLE defragmentation. The likely operational impact is disruption of wifi services. Source-confidence limits are based on CVE and NVD details. This issue requires immediate attention from defenders to ensure patched or mitigated systems.

Vendor: Linux
Product: Unknown
CVSS: HIGH 8.3
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-07-25
Original CVE updated: 2026-07-27
Advisory published: 2026-07-25
Advisory updated: 2026-07-27

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.

Sources and references

Verified primary and authoritative sources

CVE-2026-64515 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-64515

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-64515 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-64515

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Source reference
Unverified legacy reference

URL: https://git.kernel.org/stable/c/1f573e17bcb7275ddd1c8f47f46ae0faf0e902a4

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Source reference
Unverified legacy reference

URL: https://git.kernel.org/stable/c/55c479aae99b120489a432db9c717484e523dfd6

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Source reference
Unverified legacy reference

URL: https://git.kernel.org/stable/c/722b3f86df80644463d29fe5451e30a617f74500

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Source reference
Unverified legacy reference

URL: https://git.kernel.org/stable/c/a74e893f30db64cdce0fc7a96d3baa417bcd55f5

416baaa9-dc9f-4396-8d5f-8c081fb06d67

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.