In the Linux kernel, the following vulnerability has been resolved: Fix out-of-bounds read in LDT setup. The function syscall_stub_data() expects the data_count parameter to be the number of longs, not bytes. This misconfiguration can lead to a stack-out-of-bounds read, which may allow attackers to exploit the vulnerability and gain unauthorized access to sensitive data.
The CVSS score for this vulnerability is 7.1, classifying it as high severity. This indicates that the vulnerability can be exploited by attackers with local access, and the impact on confidentiality and availability is significant. Given the potential risks, organizations must take immediate action to address this vulnerability.
Risk to organizations includes unauthorized access to critical system resources which could be exploited to execute malicious activities. It is essential for organizations to prioritize patching immediately to prevent potential exploitations.
Currently, there is no known public exploit for this vulnerability, but it is crucial to monitor for any developments in the threat landscape.
Organizations should ensure their systems are updated with the latest patches to mitigate risks associated with this vulnerability as soon as possible.
Vulnerability Details
The vulnerability occurs in the Linux kernel during the setup of local descriptor tables (LDT). The function syscall_stub_data() is incorrectly handling the data_count parameter, leading to an out-of-bounds read. This can potentially allow an attacker to read sensitive data from the kernel stack.
The CVSS score of 7.1 indicates a high severity level, with a LOCAL attack vector, LOW attack complexity, and LOW privileges required. The confidentiality impact is HIGH, and the availability impact is also HIGH.
The vulnerability was published on February 26, 2025, and affects multiple versions of the Linux kernel.
Technical Analysis
The root cause of this vulnerability stems from improper handling of the data_count parameter in syscall_stub_data(). When the parameter is interpreted incorrectly, it results in an out-of-bounds read, leading to potential data leakage from the kernel stack.
The attack vector for exploitation is local, requiring an attacker to have local access to the system. The attack complexity is low, as it does not require significant technical knowledge. Additionally, the attacker does not need any user interaction to exploit this vulnerability.
The vulnerability impacts confidentiality, potentially exposing sensitive data, while the integrity is not affected, and availability may also be compromised.
Risk & Impact Analysis
The real-world deployment risk associated with this vulnerability is significant, as it could allow attackers with local access to gain unauthorized insight into sensitive data and potentially escalate their privileges.
The blast radius of this vulnerability is considerable, given that it affects a core component of the operating system. Organizations utilizing affected versions of the Linux kernel must be vigilant and prioritize remediation efforts.
Given the CVSS score of 7.1, organizations should address this vulnerability in their priority patch cycle to mitigate potential risks effectively.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of the Linux kernel prior to vendor patch, specifically versions from 2.6.15 up to 5.18.2, excluding certain patched versions.
Mitigation & Remediation
Organizations should apply patches provided by the Linux kernel maintainers to remediate this vulnerability. For systems that are unable to patch immediately, consider implementing configuration hardening and network controls to limit exposure.
More information on the necessary patches can be found in the Linux kernel patch documentation.
Detection Guidance
Monitoring logs for abnormal syscall behavior and stack overflow errors can aid in detecting attempts to exploit this vulnerability. It is also recommended to review system access logs for unauthorized access patterns.
AppSecure Threat Intelligence Insight
This vulnerability represents a significant threat as it affects a core component of the operating system. Security teams should prioritize understanding the implications of such vulnerabilities and the potential for exploitation.
Organizations are encouraged to adopt a comprehensive security posture that includes regular updates and patches as part of their operational security hygiene.
For further reading on effective security strategies, organizations can refer to our guide on penetration testing methodology and the importance of vulnerability management programs.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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