CVE-2024-25743 is a high-severity vulnerability in the Linux kernel that exists through version 6.9. This vulnerability allows an untrusted hypervisor to inject virtual interrupts, specifically interrupts 0 and 14, at any point in time. The consequence of this action is the triggering of the SIGFPE (floating-point exception) signal handler in userspace applications, which can lead to unintended behavior or crashes.
The CVSS score for this vulnerability is 7.1, indicating a high level of severity. This score is significant as it highlights the potential risk to organizations that utilize the affected kernel versions. The vulnerability particularly impacts systems utilizing AMD SEV-SNP and AMD SEV-ES technologies.
Risk to organizations includes the possibility of attackers leveraging this vulnerability to disrupt critical applications, leading to a loss of integrity and confidentiality. Organizations should prioritize patching immediately to mitigate these risks.
Current exploitation status indicates that no known exploits exist for this vulnerability, but the potential for future exploitation remains a concern. Therefore, organizations are urged to take corrective actions promptly.
Given the nature of this vulnerability, organizations should address it in their priority patch cycle to prevent any possible impact on their operations.
Vulnerability Details
The official description of CVE-2024-25743 states: "In the Linux kernel through 6.9, an untrusted hypervisor can inject virtual interrupts 0 and 14 at any point in time and can trigger the SIGFPE signal handler in userspace applications. This affects AMD SEV-SNP and AMD SEV-ES."
This vulnerability is classified under CWE-20, which pertains to improper input validation. The CVSS 3.1 score indicates a base score of 7.1, reflecting a high severity level. The attack vector is local, with low complexity and low privileges required for exploitation. User interaction is not necessary, and the impacts on confidentiality and integrity are high, while availability is unaffected.
Technical Analysis
The root cause of CVE-2024-25743 lies in the Linux kernel's inability to properly manage virtual interrupts from untrusted hypervisors. This design flaw allows unauthorized injection of interrupts, which can disrupt the execution of userspace applications. As a result, applications that rely on reliable signal handling may encounter unexpected behaviors, leading to application crashes or erratic performance.
The attack vector is local, as the vulnerability requires access to the underlying system to exploit. Attack complexity is low, meaning an attacker with basic skills could potentially trigger the vulnerability without sophisticated tools or techniques. Privileges required are also low, allowing users with limited access to exploit this vulnerability.
No user interaction is required to exploit this vulnerability, which increases the risk as it can be executed autonomously. The impact on confidentiality and integrity is rated as high, indicating that sensitive data may be compromised, and the overall reliability of the system could be affected.
The availability impact is rated as none, meaning that the system's uptime would not be directly affected by this vulnerability. However, the cascading effects on applications can lead to significant operational issues.
Risk & Impact Analysis
Organizations utilizing the Linux kernel through version 6.9 need to be aware of the real-world deployment risks associated with this vulnerability. The potential for an untrusted hypervisor to inject interrupts creates a significant attack surface that could be exploited in various environments, particularly those using AMD SEV-SNP and SEV-ES.
The blast radius for this vulnerability could be extensive, affecting multiple applications if a successful exploit occurs. Given that attackers may leverage this vulnerability to disrupt normal operations, the implications for business continuity and data integrity are critical.
The urgency assessment based on CVSS indicates that this vulnerability should be prioritized for remediation. Organizations should incorporate this into their patch management practices to mitigate risks effectively.
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 through 6.9. Organizations should ensure that they are using the latest patched version of the Linux kernel to mitigate this risk effectively.
Mitigation & Remediation
To mitigate this vulnerability, organizations should consider upgrading to the latest version of the Linux kernel that addresses this issue. If a patch is not immediately available, organizations may implement configuration hardening to limit the impact of potential exploits.
Network controls should be implemented to restrict access to systems running vulnerable versions of the kernel. Additionally, continuous security testing can help identify any weaknesses in the system before they can be exploited.
Continuous penetration testing can validate the effectiveness of these mitigations and ensure that security measures remain robust.
Detection Guidance
Organizations should monitor logs for unusual behavior that may indicate attempts to exploit this vulnerability. Behavioral anomalies associated with interrupt handling should be flagged for further investigation.
Network signatures that identify unauthorized virtual interrupt injections can help in detecting potential exploitation attempts. System changes should also be monitored closely, particularly in environments utilizing AMD SEV-SNP and SEV-ES.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2024-25743 lies in its potential to highlight vulnerabilities in hypervisor security across various platforms. As virtualization technology continues to evolve, the risks associated with untrusted hypervisors must be addressed proactively.
This vulnerability may represent a trend in increasing reliance on hypervisors for security, which can inadvertently introduce new attack vectors if not managed properly. Security teams must remain vigilant and adopt a comprehensive security posture to mitigate risks associated with hypervisor vulnerabilities.
To reinforce defenses, organizations should consider incorporating penetration testing into their security strategy to identify and address potential weaknesses before they can be exploited.
Moreover, organizations should stay informed about emerging threats and vulnerabilities to ensure that they can adapt their security measures accordingly.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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