In the Linux kernel, a memory leak vulnerability has been identified in the wifi + bluetooth combo chip drivers, specifically affecting RTL8723BU and RTL8192EU. This vulnerability allows memory to be leaked when the chip is connected to a bluetooth audio device due to busy bluetooth traffic generating numerous card-to-host (C2H) messages that are not correctly freed. This issue could lead to performance degradation over time as memory resources are consumed.
Although the vulnerability is categorized as low risk, it is crucial for organizations to understand its implications. With a CVSS score of 0, it is considered to have an unknown severity and is marked as deferred. Organizations should assess their systems for potential impacts and stay informed about any patches or updates that may address this issue in the future.
The current status of this vulnerability indicates that it has not yet been actively exploited. However, the possibility of future exploitation cannot be ruled out, and organizations should maintain a proactive approach to vulnerability management.
Organizations should prioritize monitoring for updates related to this vulnerability and consider remediation strategies as they become available. Staying informed will help mitigate potential risks associated with this vulnerability.
Vulnerability Details
In the Linux kernel, the following vulnerability has been resolved: wifi: rtl8xxxu: Fix memory leaks with RTL8723BU, RTL8192EU. The wifi + bluetooth combo chip RTL8723BU can leak memory when connected to a bluetooth audio device due to busy bluetooth traffic generating C2H messages that are not freed correctly. The fix involves moving the dev_kfree_skb() call inside the loop where skb_dequeue() is called. The RTL8192EU also leaks memory because C2H messages are added to the queue and left indefinitely.
Theoretically, the RTL8188FU could also leak memory like the RTL8723BU, but it likely does not send C2H messages frequently enough. This change was tested with RTL8723BU and other chips by Erhard F.
Technical Analysis
The root cause of this vulnerability stems from improper handling of memory during the processing of C2H messages, which, if not addressed, can lead to memory leaks. The attack vector is primarily local, as the exploitation would require access to the affected device. The attack complexity is considered low, and no user interaction is required to trigger the issue.
The impact on confidentiality, integrity, and availability is low, given the nature of the vulnerability. However, it could cause system performance issues over time due to memory consumption.
Risk & Impact Analysis
Risk to organizations includes performance degradation of affected systems as memory leaks accumulate. Although the current classification indicates low severity, organizations must consider the potential for increased risks as the vulnerability remains unaddressed. The urgency for remediation is classified as low, allowing organizations to address this during routine maintenance.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Specific affected versions are not available. Organizations should assume that all versions of the Linux kernel prior to any patches that address this vulnerability are potentially affected.
Mitigation & Remediation
Organizations should monitor for updates regarding this vulnerability and apply patches as they become available. Remediation efforts may involve updating the Linux kernel to the latest version or applying temporary workarounds to mitigate memory leaks until a permanent fix is deployed. For more effective security measures, organizations can engage in penetration testing to identify potential vulnerabilities.
Detection Guidance
Monitoring for unusual memory consumption patterns and maintaining comprehensive logs will assist organizations in detecting any anomalies that may arise due to this vulnerability. Behavioral analysis should focus on understanding normal operational thresholds to identify deviations that may indicate exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential to impact system performance as memory leaks accumulate. This case emphasizes the importance of proactive monitoring and timely patch application. Security teams are reminded to stay updated on emerging vulnerabilities and adopt a robust vulnerability management strategy to minimize the risk of exploitation.
For further reading on vulnerability management best practices, consider exploring the vulnerability management program, as well as the latest trends in penetration testing and security assessments.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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