CVE-2026-64408 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution maintainers, and users of Linux systems should assess exposure and prioritize verification of affected versions and application of patches.

Why it matters

The Linux kernel's Bluetooth BNEP implementation is vulnerable to a use-after-free attack, which could allow for a parent device to be dereferenced after it has been freed. Linux kernel maintainers and users should assess exposure and prioritize verification of affected versions and application of patches.

• Verify Linux kernel versions and assess exposure to the vulnerability
• Apply patches to mitigate the use-after-free vulnerability in the Linux kernel's Bluetooth BNEP implementation
• Monitor Linux kernel updates and security advisories for further information on the vulnerability

Technical summary

The Linux kernel's Bluetooth BNEP implementation is vulnerable to a use-after-free attack. The `bnep_add_connection` function does not properly handle concurrent controller teardown, allowing for a parent device to be dereferenced after it has been freed. This vulnerability could allow an attacker to cause a denial of service or potentially execute arbitrary code. Linux kernel maintainers and users should assess exposure and prioritize verification of affected versions, as well as applying patches to mitigate the vulnerability. The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions.

Defensive priority

Linux kernel maintainers and users should assess exposure and prioritize verification of affected versions, as well as applying patches to mitigate the vulnerability.

Recommended defensive actions

• Review and apply patches to the Linux kernel to fix the BNEP use-after-free vulnerability
• Verify affected versions of the Linux kernel and assess exposure
• Monitor Linux kernel updates and security advisories for further information
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• 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 CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. Multiple patch references are provided, indicating fixes for the vulnerability.

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.