CVE-2022-3564 Linux CVE debrief

Who should care

Linux Kernel maintainers, Linux distribution maintainers, and users of Linux-based systems, particularly those using Bluetooth, should assess their exposure and prioritize patching.

Why it matters

This use-after-free vulnerability in the Linux Kernel's Bluetooth l2cap_core.c file has a medium CVSS score of 5.5 and can be exploited remotely with low privileges. Linux Kernel maintainers and users should prioritize patching to prevent exploitation.

• Remote attackers with low privileges may exploit this vulnerability
• Successful exploitation could lead to system crashes or potential code execution
• Linux Kernel maintainers and users should prioritize patching to prevent exploitation
• Verify Linux Kernel versions and apply patches to mitigate the vulnerability

Technical summary

The l2cap_reassemble_sdu function in the Linux Kernel's Bluetooth l2cap_core.c file is vulnerable to a use-after-free attack. This occurs when the function attempts to access memory that has already been freed, potentially leading to crashes or code execution. The vulnerability can be exploited remotely with low privileges, and Linux Kernel maintainers and users should prioritize patching to prevent exploitation. The affected product context includes Linux Kernel versions that use the Bluetooth l2cap_core.c file. Defensive impact includes potential system crashes or code execution, and source-grounded technical framing emphasizes the importance of patching to prevent exploitation.

Defensive priority

Medium priority for Linux Kernel maintainers and users, as the vulnerability can be exploited remotely with low privileges.

Recommended defensive actions

• Review and apply patches from Linux Kernel maintainers
• Check Linux Kernel versions for updates and apply patches
• Monitor Bluetooth-related logs for suspicious activity
• Consider implementing compensating controls, such as firewall rules or intrusion detection systems
• 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

Evidence notes

The CVE record and source item provide details about the vulnerability, but do not specify the exact versions of the Linux Kernel that are affected. The Debian Linux security team has released advisories (DLA 3244-1 and DLA 3245-1) to address this issue. NetApp and Siemens have also released advisories (NTAP-20221223-0001 and SSA-794697) related to this 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.