A vulnerability in the Linux kernel has been identified, classified as CVE-2022-50553. This vulnerability allows for an out-of-bounds write on 'action_data.var_ref_idx', which can lead to kernel panic under certain conditions. Specifically, the issue arises when generating a synthetic event with an excessive number of parameters, exceeding the defined limits of the kernel's tracing capabilities.
The vulnerability is rated as medium severity, with a CVSS score of 5.5. This score indicates that while the vulnerability is not the highest priority, it still poses a significant risk to systems running vulnerable versions of the Linux kernel. The risk to organizations includes potential downtime due to kernel panic, which can disrupt services and operations.
Organizations should prioritize patching immediately, as this vulnerability can be exploited under specific conditions. The kernel panic can compromise system stability and may lead to data loss or corruption. Timely remediation is essential to prevent these risks.
This vulnerability affects several versions of the Linux kernel, and it is crucial for system administrators to evaluate their systems and apply necessary updates.
Vulnerability Details
The vulnerability has been officially described as follows: In the Linux kernel, when generating a synthetic event with many parameters and creating a trace action for it, a kernel panic occurs due to an out-of-bounds write in the function trace_action_create(). Specifically, the variable 'data->n_params' can exceed the length of 'data->var_ref_idx', leading to an overwrite of 'data->match_data.event' and eventually causing the kernel panic.
To mitigate this issue, the length of 'data->var_ref_idx' has been adjusted to match the maximum number of synthetic fields allowed, and additional sanity checks have been put in place to prevent out-of-bounds writes.
The CVSS score for this vulnerability is 5.5, indicating a medium severity level. The attack vector is local, requiring low complexity and low privileges, with no user interaction necessary for exploitation. The impact on availability is high, meaning that systems can become completely unstable when exploited.
Technical Analysis
The root cause of this vulnerability stems from the improper handling of parameters in the trace_action_create() function, where the number of parameters ( data->n_params ) can exceed the limit set by the 'data->var_ref_idx' array. This results in an out-of-bounds write, which ultimately leads to a kernel panic and system instability.
The attack vector is local, meaning that an attacker must have access to the local system to exploit this vulnerability. The complexity is low, as it does not require any advanced skills or specific conditions to exploit. Additionally, the attacker requires low privileges, making it accessible to less privileged users who can execute the necessary commands.
There is no user interaction required for this vulnerability, which increases the potential risk as it can be exploited without any action from the user. The impact on confidentiality and integrity is none; however, the availability impact is high, as the system can become unusable following a kernel panic.
Risk & Impact Analysis
The real-world risk associated with CVE-2022-50553 is significant, particularly for organizations that rely heavily on the Linux kernel for their operations. A successful exploitation could lead to service outages and potential data loss, impacting organizational productivity and reputation.
Given the high availability impact of this vulnerability, organizations should prioritize addressing it in their patch management cycles. The CVSS score of 5.5 indicates that while it may not be critical, it is still a medium risk that requires timely remediation to mitigate potential disruptions.
The urgency for organizations to act is compounded by the prevalence of Linux systems in various environments. Ensuring that systems are patched against this vulnerability can prevent exploitation and maintain system integrity.
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: versions from 5.4.19 up to but not including 5.4.229, versions from 5.5.6 up to but not including 5.10.163, versions from 5.11 up to but not including 5.15.87, versions from 5.16 up to but not including 6.0.18, and versions from 6.1 up to but not including 6.1.4.
Mitigation & Remediation
Organizations are urged to patch affected systems promptly. The remediation involves updating to the latest versions of the Linux kernel that address this vulnerability. If immediate patching is not possible, organizations should consider implementing workarounds or configuration hardening to minimize exposure.
Further guidance on effective mitigation strategies can be found through penetration testing services to identify any related weaknesses.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual kernel panic incidents. Behavioral anomalies in the operation of the Linux kernel, particularly during the creation of synthetic events, should also be flagged for review.
Network signatures associated with abnormal kernel behavior could provide additional context for detection efforts. System changes following kernel updates or patches should be logged and monitored for integrity.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2022-50553 emphasizes the importance of robust kernel development practices. Organizations should be aware of patterns in kernel vulnerabilities that can lead to severe impacts on system availability.
This vulnerability serves as a reminder for security teams to regularly assess their systems for outdated components. Regular updates and security assessments can help in mitigating risks associated with similar vulnerabilities.
For further insights on maintaining security within your systems, consider exploring our vulnerability management program and our penetration testing methodology resources.
Additionally, reviewing our API penetration testing guide can provide valuable insights into securing your systems against similar threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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