In the Linux kernel, a vulnerability has been identified related to the use of 'bpf_mem_alloc' in PREEMPT_RT. This vulnerability allows for potential issues when 'kmalloc(GFP_ATOMIC)' is used in a non-preemptible context. The patch aims to enforce the use of 'bpf_mem_alloc' in 'bpf_local_storage' when CONFIG_PREEMPT_RT is enabled.
The CVSS score for this vulnerability is 5.5, categorizing it as medium severity. The implications for organizations include risks associated with high availability impact due to improper memory allocation handling in the kernel.
It is critical for organizations to address this vulnerability promptly. The vulnerability has been around since the initial introduction of 'bpf_local_storage', and while there are no known exploits at this time, it is essential to apply the necessary patches to avoid any potential disruption in services.
Organizations should prioritize patching immediately to secure their systems against this vulnerability.
Vulnerability Details
The vulnerability affects the Linux kernel, specifically targeting the memory management functionalities within the BPF (Berkeley Packet Filter) subsystem. The issue arises when 'kmalloc(GFP_ATOMIC)' is incorrectly used in a context where preemption is not safe.
The CVSS score is derived from the factors such as attack vector (local), attack complexity (low), and availability impact (high). The vulnerability allows for potential crashes or instability in systems running affected versions of the Linux kernel.
The detailed patch and additional references can be found in the official kernel documentation, which addresses the necessary updates and configurations.
Technical Analysis
The root cause of this vulnerability is the improper memory allocation strategy in the context of PREEMPT_RT. The use of 'kmalloc(GFP_ATOMIC)' can lead to sleeping in an invalid context, potentially causing the kernel to crash.
The attack vector is local, meaning an attacker would need physical or administrative access to the system to exploit this vulnerability. The attack complexity is low, as it does not require sophisticated techniques, and privileges required are low, which increases the risk of exploitation.
There is no user interaction required to trigger the vulnerability, making it a significant risk for systems running vulnerable kernel versions.
Risk & Impact Analysis
Risk to organizations includes potential service disruptions due to crashes in the Linux kernel, primarily affecting availability. The blast radius could be significant if exploited, as many services and applications rely on the kernel’s stability.
Given the medium CVSS score of 5.5, organizations should address this vulnerability in their priority patch cycle to ensure their systems remain operational and secure.
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 starting from 6.4 up to 6.6.75, and versions from 6.7 to 6.12.12, as well as from 6.13 to 6.13.1. Organizations should ensure they have updated to the latest version to mitigate any risks.
Mitigation & Remediation
Organizations should apply the latest patches to their Linux kernel. The patches can be found in the official kernel repository, specifically related to the 'bpf_mem_alloc' functionality. If patches are not immediately available, organizations may consider implementing workarounds or configuration hardening to minimize exposure.
For further assistance, organizations may seek services such as penetration testing to validate their security posture.
Detection Guidance
Organizations should monitor logs for any anomalies related to memory allocation failures or kernel panic messages. It is also advisable to keep an eye on system performance metrics that may indicate instability.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of proper memory management in kernel-level programming. Security teams should take this as an opportunity to review their memory allocation strategies and ensure that best practices are followed to avoid similar vulnerabilities in the future.
For teams looking to enhance their security frameworks, it is beneficial to explore penetration testing methodology and vulnerability management program design to identify and mitigate potential weaknesses.
Lastly, continuous education on security best practices, such as engaging in API penetration testing, can be invaluable in maintaining a robust security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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