CVE-2022-49711 is a high-severity vulnerability affecting the Linux kernel, particularly in the fsl-mc-bus subsystem. This vulnerability allows attackers to exploit a use-after-free condition, which can lead to serious security implications. The CVSS score for this vulnerability is 7.8, indicating a high level of risk to organizations. The vulnerability arises from the improper handling of memory references in the fsl_mc_bus_remove() function, where a reference to a freed object can lead to unauthorized access or system crashes.
Risk to organizations includes potential unauthorized access to sensitive data and system instability. The vulnerability is categorized under CWE-416, which deals with use-after-free scenarios. Given the nature of this vulnerability and its potential to be exploited, organizations should prioritize patching immediately.
Currently, there are no known exploits or public proof of concepts available for CVE-2022-49711, but the vulnerability's characteristics indicate that it could be leveraged by attackers if left unaddressed. Therefore, organizations should monitor for updates and apply relevant patches as soon as they become available.
With the potential for serious repercussions, including data breaches or system outages, organizations must act swiftly to mitigate the risks presented by this vulnerability.
Vulnerability Details
The vulnerability described in CVE-2022-49711 stems from a flaw in the Linux kernel's handling of certain memory operations. Specifically, the problem arises in the fsl_mc_bus_remove() function, where the reference to mc->root_mc_bus_dev->mc_io is used after the object has been freed. This misuse can trigger a KASAN use-after-free condition, leading to unpredictable behavior or exploitation.
The CVSS score of 7.8 indicates a high severity level, with the following metrics: attack vector is LOCAL, attack complexity is LOW, privileges required are LOW, user interaction is NONE, and impacts on confidentiality, integrity, and availability are all rated as HIGH. This highlights the critical nature of the vulnerability and the need for prompt remediation.
The vulnerability affects all versions of the Linux kernel from 4.8 up to but not including 5.10.248, as well as versions from 5.11 to just below 5.15.49, and from 5.16 to just below 5.18.6. Additionally, the specific release candidates 5.19:rc1 and 5.19:rc2 are also impacted.
Technical Analysis
The root cause of CVE-2022-49711 is the inappropriate memory management within the Linux kernel, specifically in the fsl_mc_bus subsystem. The attack vector is local, meaning that an attacker would need local access to the system to exploit this vulnerability. The complexity of the attack is low, indicating that it could be executed easily with minimal effort.
The vulnerability requires low privileges to exploit, and no user interaction is needed. If successfully exploited, it could lead to critical impacts on confidentiality, integrity, and availability, as the attacker may gain access to sensitive information or disrupt system functionality.
Risk & Impact Analysis
Real-world deployment of CVE-2022-49711 poses significant risk to organizations using the affected versions of the Linux kernel. The potential for attackers to exploit this vulnerability and gain unauthorized access to sensitive data is a serious concern. Additionally, the blast radius could be extensive, affecting systems that rely on the kernel for critical operations.
The urgency assessment based on the CVSS score of 7.8 categorizes this vulnerability as high priority. Organizations should address it in their priority patch cycle to mitigate potential risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of the Linux kernel include all versions from 4.8 up to but not including 5.10.248, versions from 5.11 to below 5.15.49, and from 5.16 to below 5.18.6. Specific release candidates 5.19:rc1 and 5.19:rc2 are also vulnerable.
Mitigation & Remediation
Organizations should prioritize patching to remediate CVE-2022-49711. The Linux kernel team has provided patches that need to be applied for the versions affected. For systems that cannot be patched immediately, it is recommended to implement workarounds such as restricting access to the vulnerable components or monitoring for unusual behavior in the system.
For ongoing protection and security assessments, organizations can consider conducting a penetration testing engagement to identify and remediate similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts related to CVE-2022-49711. Key indicators include unexpected system crashes, unauthorized access attempts, or anomalies in memory usage. Additionally, behavioral signatures related to the fsl-mc-bus subsystem should be analyzed for any deviations from normal operation.
AppSecure Threat Intelligence Insight
CVE-2022-49711 highlights the importance of robust memory management practices in kernel development. As vulnerabilities like this emerge, they often indicate broader patterns in software development practices that need addressing. Security teams should focus on enhancing their code review processes and implementing thorough testing methodologies to prevent similar vulnerabilities.
By investing in a comprehensive penetration testing methodology, organizations can improve their resilience against evolving threats.
Furthermore, understanding the trends in vulnerabilities can guide organizations in prioritizing their security efforts. Engaging in ongoing security research, such as following updates on similar vulnerabilities, can enhance an organization’s overall security posture.
To learn more about effective vulnerability management strategies, organizations can explore resources such as vulnerability management programs and best practices.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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