In the Linux kernel, a vulnerability has been identified related to Bluetooth functionality. Specifically, this vulnerability allows for a use-after-free (UAF) condition in the hci_disconnect_all_sync function. This issue arises when a connection is deleted during the concurrent processing of a controller event, potentially leading to system crashes.
This vulnerability has been classified with an unknown severity level. As it is currently deferred, organizations should remain vigilant and monitor for updates regarding patches or fixes. The potential risk to organizations includes system instability and unexpected behavior if exploited.
Currently, no public exploit has been confirmed for this vulnerability, and it is not included in the Known Exploited Vulnerabilities (KEV) catalog. However, organizations should prioritize staying informed and be prepared to act as more information becomes available.
Organizations should prioritize monitoring developments related to this vulnerability to ensure timely remediation, particularly as the situation evolves.
Vulnerability Details
The vulnerability described allows for a use-after-free condition to occur in the Linux kernel's Bluetooth component, specifically in the hci_disconnect_all_sync function. The issue arises when a connection gets deleted during concurrent processing, which can lead to crashes and system instability.
The reported UAF crash log reveals significant details about the vulnerability, indicating that a slab-use-after-free error occurred in hci_set_powered_sync. The developers have implemented measures to iterate over the connection list backwards to prevent UAF conditions and ensure proper cleanup.
The publication date of this vulnerability is December 8, 2025, and it remains classified as deferred, with no CVSS score currently assigned. As a result, the urgency for remediation is currently low, but organizations should remain aware of any updates related to this vulnerability.
Technical Analysis
The root cause of this vulnerability lies in the concurrency of event processing within the Bluetooth stack in the Linux kernel. When a connection is deleted while another process is accessing it, a use-after-free condition arises, leading to potential crashes.
The attack vector for this vulnerability is considered local, as it requires access to the system to trigger the conditions leading to the UAF situation. The complexity of exploiting this vulnerability is assessed as high, given the need for concurrent processing events and proper timing.
Privileges required for exploitation are low, as the vulnerability can be triggered with standard user permissions. User interaction is not required to exploit this vulnerability, making it particularly concerning for systems with multiple active connections.
Risk & Impact Analysis
The real-world risk associated with this vulnerability involves the potential for system crashes and instability, particularly in systems utilizing Bluetooth functionality. Given that Bluetooth is a widely used protocol in various devices, the impact could be significant.
This vulnerability represents a potential blast radius where multiple systems could be affected if exploited. The lack of current exploitation or public proof-of-concept does not eliminate the risk entirely, and organizations should remain cautious.
Organizations should consider the low EPSS score of 0.00032, which indicates a very low probability of exploitation. However, this does not negate the importance of monitoring for any shifts in the threat landscape that may increase the likelihood of exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
As the vendor has not provided specific version information, it is advised to consider all versions of the Linux kernel prior to the patch as potentially affected. Organizations should stay updated with the latest patches and security advisories for the Linux kernel.
Mitigation & Remediation
Organizations should prioritize applying the latest patches and updates provided by the Linux kernel maintainers. Regularly checking for updates is crucial to mitigate vulnerabilities effectively.
If an immediate patch is unavailable, organizations should implement network segmentation and access controls to limit exposure to potential exploitation paths. Monitoring for unusual Bluetooth activity can also help detect potential exploitation attempts.
For more comprehensive security assessments, organizations may consider engaging in penetration testing services to identify and remediate potential vulnerabilities in their systems.
Detection Guidance
To detect any potential exploitation attempts related to this vulnerability, organizations should monitor logs for anomalies, especially those related to Bluetooth connections. Behavioral indicators such as increased connection attempts or failed disconnections can signal attempted exploitation.
Additionally, maintaining a robust logging framework that tracks system changes can help identify any unauthorized access attempts or unusual activities.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-53762 highlights ongoing challenges within the Linux kernel, particularly involving Bluetooth security. This vulnerability points to the need for continuous security evaluations in widely utilized protocols.
Security teams are reminded of the importance of proactive vulnerability management practices to identify and mitigate risks before they become critical threats. Regular assessments and audits can help organizations stay ahead of emerging vulnerabilities.
For further insights into effective security practices, organizations can refer to our comprehensive resources on vulnerability management programs and strategies for effective penetration testing to enhance overall security posture.
Organizations should also consider engaging in cloud security assessments to identify vulnerabilities unique to cloud environments.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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