In the Linux kernel, a vulnerability has been resolved related to handling larger packets in the vhost/vsock module. This issue arises when copying large files over SFTP via vsock, where the data size typically reaches 32kB. The allocation attempts using kmalloc have been observed to fail under certain conditions, thereby leading to allocation failures. This vulnerability has been classified with a CVSS score of 5.5, indicating a medium severity level due to its potential impact on availability.
Risk to organizations includes potential denial of service when attempting to transfer large files, which can disrupt operations and impact service availability. Given the nature of the issue, organizations should be vigilant regarding the use of affected kernel versions and prioritize patching to avoid service interruptions.
Currently, there is no known public exploit for this vulnerability, and it is not included in the Known Exploited Vulnerabilities (KEV) catalog. However, organizations should not become complacent as the situation may change, and proactive measures are essential to maintain security.
Organizations should prioritize patching immediately to mitigate risks associated with this vulnerability and ensure system integrity and availability.
Vulnerability Details
The vulnerability described in CVE-2022-50271 affects the Linux kernel, specifically in the vhost/vsock module, which is responsible for virtual socket communication. The issue arises when attempting to allocate memory for larger packets, with kmalloc failing to allocate the necessary memory blocks. This results in allocation failures that can lead to operational disruptions.
The official CVSS score for this vulnerability is 5.5, categorized as medium severity. The attack vector is classified as local, with low complexity, requiring low privileges and no user interaction. The availability impact is assessed as high, emphasizing the need for organizations to address this vulnerability promptly.
Technical Analysis
The root cause of CVE-2022-50271 lies in the memory allocation mechanism within the Linux kernel's vhost/vsock implementation. When copying large files, the attempt to allocate multiple 32kB memory regions using kmalloc can fail, resulting in page allocation failures. The allocation complexity is low, and the attacker does not need elevated privileges or user interaction to exploit this vulnerability.
The vulnerability impacts the availability of services that rely on this component, as failure to allocate the required memory can lead to service disruptions. Organizations should analyze their usage of the Linux kernel and assess any implications on their service availability.
Risk & Impact Analysis
The real-world risk posed by CVE-2022-50271 includes potential denial-of-service scenarios in environments relying on the Linux kernel for handling virtual sockets. The impact can span across various applications and services, leading to significant operational disruptions. Given the medium severity and high availability impact, organizations should address this vulnerability in their patch management cycles.
With the current CVSS score of 5.5 and low exploitability, organizations should remain aware of potential changes in the threat landscape. Continuous monitoring for new developments related to this vulnerability is recommended.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects all versions of the Linux kernel from 4.8 up to, but not including, 4.14.296, as well as versions 4.15 to 4.19.262, 4.20 to 5.4.220, 5.5 to 5.10.150, 5.11 to 5.15.75, 5.16 to 5.19.17, and 6.0 to 6.0.3.
Mitigation & Remediation
Organizations are advised to update their Linux kernels to versions that contain the patches addressing this vulnerability. The specific patches are available through the Linux kernel source repositories. For effective risk management, organizations should also consider implementing configuration hardening and network controls to mitigate potential impacts.
Penetration testing can also be valuable in assessing the effectiveness of the applied mitigations.
Detection Guidance
Monitoring logs for memory allocation failures during large file transfers can serve as an indicator of potential exploitation attempts. Additionally, behavioral anomalies related to virtual socket communication should be investigated. Organizations should implement appropriate monitoring solutions to detect these indicators.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2022-50271 lies in its demonstration of the importance of robust memory management within the Linux kernel. This vulnerability represents a pattern of memory allocation issues that can arise in complex systems, highlighting the need for continuous vigilance and improvement in software development practices.
Security teams should take this as a lesson to enhance review processes surrounding memory management in kernel development. Regular audits and testing can help identify similar weaknesses before they are exploited.
For further reading on best practices in security, organizations can refer to resources on penetration testing methodology and vulnerability management programs to strengthen their defenses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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