In the Linux kernel, a significant vulnerability identified as CVE-2022-50421 has been reported. This vulnerability allows for a double destroy of the default endpoint due to improper management in the rpmsg subsystem. Specifically, the rpmsg_dev_remove() function in rpmsg_core is responsible for releasing the default endpoint. Failure to avoid destroying this endpoint in rpmsg_chrdev_eptdev_destroy() can lead to a double destroy scenario, which triggers warnings related to reference counting, indicating possible use-after-free conditions. This flaw can be reproduced by stopping the remote processor before closing the /dev/rpmsgX device.
The severity level for this vulnerability is classified as high, with a CVSS score of 7.8. This high score reflects the potential impact on confidentiality, integrity, and availability, all rated as high. Organizations utilizing affected versions of the Linux kernel should be particularly vigilant, as exploitation could lead to unauthorized access or system instability.
Given the urgency, organizations should prioritize patching immediately. The implications of the vulnerability are significant, making it critical to address this issue in a timely manner. The Linux kernel has undergone modifications to resolve this vulnerability, and users are encouraged to apply the recommended patches to mitigate the associated risks.
In summary, CVE-2022-50421 represents a substantial risk to organizations running vulnerable versions of the Linux kernel. Immediate action is required to ensure systems remain secure.
Vulnerability Details
The vulnerability in question is classified under CWE-416, which pertains to use-after-free issues. The critical aspects of this vulnerability include:
• Affected Product: linux_kernel • CVSS Score: 7.8 (High) • Attack Vector: Local • Attack Complexity: Low • Privileges Required: Low • User Interaction: None • Confidentiality Impact: High • Integrity Impact: High • Availability Impact: High • Publication Date: October 1, 2025
Technical Analysis
The root cause of CVE-2022-50421 lies in the improper management of endpoints within the rpmsg subsystem of the Linux kernel. When the default endpoint is destroyed incorrectly, it can lead to double destruction issues that trigger warnings regarding reference counting. This can result in potential use-after-free vulnerabilities, which may be exploited by attackers to gain unauthorized access to system resources.
The attack vector is classified as local, meaning that an attacker must have local access to the system to exploit this vulnerability. The attack complexity is low, as no special conditions are required for exploitation. The privileges required are also low, allowing attackers with standard user access to potentially exploit this flaw.
No user interaction is required, making this vulnerability particularly dangerous, as it can be exploited without any action on the part of the victim. The impacts on confidentiality, integrity, and availability are all rated as high, meaning that successful exploitation could lead to a complete compromise of the affected system.
Risk & Impact Analysis
The real-world risk associated with CVE-2022-50421 is significant. Organizations running vulnerable versions of the Linux kernel could face severe exploitation consequences, including unauthorized access to sensitive data, system instability, and potential service disruptions. The blast radius of this vulnerability could be extensive, particularly in environments where the Linux kernel is widely deployed.
Given the CVSS score of 7.8 and the current lack of known exploitation in the wild, organizations must remain vigilant. However, the potential for widespread impact necessitates prioritizing patching and remediation efforts. As this vulnerability may allow attackers to leverage significant privileges, organizations should assess their risk posture and update their systems accordingly.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of the Linux kernel are affected by this vulnerability:
• All versions from 5.18 up to but not including 5.19.17 • All versions from 6.0 up to but not including 6.0.3
Mitigation & Remediation
Organizations should ensure they apply the latest patches available for the Linux kernel. Specifically, they should upgrade to versions that are not affected by CVE-2022-50421. For systems that cannot be immediately patched, consider implementing configuration hardening to minimize exposure and risk.
In addition, regular security assessments through services such as penetration testing can help identify and remediate similar weaknesses.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor system logs for unusual reference count warnings or errors related to the rpmsg subsystem. Behavioral anomalies such as unexpected system crashes or restarts may also indicate exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2022-50421 highlights the necessity for robust endpoint management within the Linux kernel. As vulnerabilities of this nature can lead to severe consequences, security teams should consider adopting proactive measures. Regular updates and comprehensive vulnerability management programs are vital in identifying and addressing such issues early.
Furthermore, organizations should stay informed about emerging threats and trends in vulnerabilities through continuous learning and development. For reference, organizations can consult resources on penetration testing methodology to enhance their security posture.
Overall, understanding the context and potential impact of CVE-2022-50421 provides valuable lessons for security teams aiming to strengthen their defenses against similar vulnerabilities in the future.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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