In the Linux kernel, the following vulnerability has been resolved: net: bridge: xmit: make sure we have at least eth header len bytes. This vulnerability allows local attackers to send a short skb (less than ETH_HLEN bytes) that triggers an uninitialized value error in the bridge device's xmit path. The error arises from an assumption about the availability of bytes to pull without verification. Organizations should prioritize patching immediately.
The vulnerability has a CVSS score of 7.1, indicating a high severity level. This is significant as it may lead to denial of service and high confidentiality impact. The attack vector is local, which implies that an attacker must have local access to exploit the vulnerability. Given the potential impact, organizations must address this issue as part of their immediate patching cycle.
Risk to organizations includes unauthorized access to sensitive information and potential system downtime. With a known exploit not present and the vulnerability not listed in the KEV catalog, immediate remediation remains critical.
The vulnerability was published on June 19, 2024, and organizations should verify they are running versions of the Linux kernel that are not affected to ensure security.
Vulnerability Details
The vulnerability in question allows local attackers to exploit a flaw in the bridge device's xmit path. Specifically, it occurs when a short skb is sent, which can lead to an uninitialized value error. This has been classified under CWE-908. The Linux kernel versions affected include versions from 2.6.12 up to but not including 6.1.93, and several subsequent versions based on the configuration details.
Technical Analysis
Root cause analysis indicates that the issue arises from an assumption in the code regarding the minimum length of the Ethernet header. The attack vector is local, with low complexity involved in exploiting the vulnerability. The privileges required are also low, meaning that a regular user may exploit it without elevated permissions. User interaction is not required for exploitation, which increases the risk factor.
From a security standpoint, the confidentiality impact is high, while integrity impact is none, and availability impact is also high. Organizations must monitor for any unusual network behavior that may indicate attempts to exploit this vulnerability.
Risk & Impact Analysis
Real-world deployment risk is significant as this vulnerability could be leveraged to disrupt services or gain unauthorized access to sensitive information. The blast radius potential is considerable, especially in environments where the Linux kernel is widely used. Organizations should address this vulnerability in their priority patch cycle due to its high CVSS score of 7.1.
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 6.1.93, specifically versions starting from 2.6.12 up to but not including 6.1.93, between 6.2 and 6.6.33, 6.7 and 6.8.12, and 6.9 and 6.9.3.
Mitigation & Remediation
Organizations must apply the appropriate patches to remediate this vulnerability. The patches can be found in the Linux kernel's update logs; it is essential to upgrade to the latest version that addresses this vulnerability. If immediate patching is not feasible, organizations should implement network controls to limit access to affected systems and monitor for unusual activities.
For continuous security improvements, organizations can assess their security posture through continuous penetration testing to identify potential vulnerabilities.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor system logs for specific indicators such as unusual network traffic patterns, particularly from local sources. Behavioral anomalies in network activity, especially during times when bridge devices are under load, should also be investigated.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2024-38538 lies in its potential to affect numerous devices utilizing the Linux kernel. The pattern of vulnerabilities in software components like kernels is a reminder of the importance of robust security measures throughout the software lifecycle. Security teams should take this incident as a strategic lesson to implement comprehensive testing and monitoring strategies.
For more insights on improving security frameworks, organizations can refer to our penetration testing methodology and enhance their application security assessments through effective strategies.
Understanding vulnerabilities like this can aid in fostering a proactive security culture. Organizations are encouraged to strengthen their defenses using resources like our vulnerability management program to systematically address security challenges.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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