In the Linux kernel, the following vulnerability has been resolved: ipvlan: Fix use-after-free in ipvlan_get_iflink(). This vulnerability allows local attackers to exploit the freed memory due to a use-after-free condition in the ipvlan module, which is triggered when the linkwatch work is activated.
The severity of this vulnerability is classified as high, with a CVSS score of 7.8. It is crucial for organizations to understand the implications of this vulnerability, as it can lead to unauthorized access or manipulation of kernel memory.
Risk to organizations includes potential data breaches and system instability, making it essential to prioritize remediation efforts. Immediate patching is recommended to mitigate risks associated with this vulnerability.
As of now, there are no known public exploits or proofs of concept available for this vulnerability, but the potential for exploitation remains a concern for security teams.
Organizations should prioritize patching immediately.
Vulnerability Details
In detail, the vulnerability arises because ipvlan does not hold a reference count of the lower device, unlike similar modules such as vlan and macvlan. If the linkwatch work is triggered for the ipvlan device, the lower device might have already been freed, resulting in a use-after-free condition of ipvlan->phy_dev in ipvlan_get_iflink().
The vulnerability was published on January 19, 2025, and has been assigned CWE-416, which refers to use-after-free vulnerabilities. The fix involves holding the lower device's reference count during initialization and releasing it correctly.
The official CVE descriptions emphasize the need for proper handling of device registration and unregistration to avoid this type of vulnerability.
Technical Analysis
The root cause of this vulnerability is the failure to manage references to the lower device within the ipvlan module. This oversight leads to a use-after-free scenario when the linkwatch mechanism triggers operations that assume the lower device is still valid.
The attack vector for this vulnerability is local, with low complexity and low privileges required. There is no user interaction needed, meaning that an attacker with local access to the system can potentially exploit this vulnerability without additional steps.
The impact on confidentiality, integrity, and availability is high, as exploitation could lead to unauthorized access to sensitive data, manipulation of system resources, or complete system compromise.
Risk & Impact Analysis
Real-world deployment risk is significant for organizations running vulnerable versions of the Linux kernel, especially in environments where local access is possible. The blast radius could be extensive, as the vulnerability affects core networking functionalities.
This means that attackers could leverage this vulnerability to gain administrative control over affected systems, leading to data breaches or service disruptions. Given the CVSS score of 7.8 and the absence of public exploits, organizations should still treat this vulnerability with urgency.
Organizations should address this vulnerability in their priority patch cycle to ensure system integrity and security.
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 from 6.2 up to, but not including, 6.6.72, as well as specific release candidates of version 6.13 (rc1 through rc6).
Mitigation & Remediation
Organizations should apply the available patches to their Linux kernel installations promptly. For those unable to update immediately, implementing configuration hardening and network controls can mitigate risks until a patch can be applied.
Additional guidance and best practices for vulnerability management can be found through vulnerability management programs that ensure systematic remediation of vulnerabilities.
Detection Guidance
Monitoring for unusual activity in kernel operations and maintaining logs for device states can help in early detection of potential exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights the importance of robust memory management practices in kernel development. Security teams should take note of this incident as it represents a pattern of vulnerabilities often related to improper memory handling.
Organizations are encouraged to enhance their training on memory safety and conduct regular code reviews to identify similar vulnerabilities. For further insights into effective security practices, refer to penetration testing methodologies and vulnerability management programs that support proactive security measures.
Finally, organizations should stay informed about emerging trends in vulnerability exploitation by reviewing resources such as 2025 vulnerability exposure severity trends to understand their threat landscape better.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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