CVE-2026-23000 is a medium-severity vulnerability in the Linux kernel that addresses a critical issue related to network device profile changes. Specifically, the vulnerability allows a failure to attach a new network profile or a failure to roll back to an old profile, leading to a dangling net device with an invalid reference. Attempting to retry the profile change can cause a system crash due to a null pointer dereference.
The CVSS score assigned to this vulnerability is 5.5, indicating a medium severity level. This score reflects the potential availability impact, which is classified as high due to the risk of system crashes. Given the nature of the vulnerability and its potential to disrupt system operation, it is crucial for organizations to address this issue promptly.
Risk to organizations includes the possibility of losing system availability when the network device fails to operate correctly due to this vulnerability. Attackers may leverage this flaw to cause service disruptions, particularly in environments heavily reliant on Linux kernel networking functionalities.
Organizations should prioritize patching immediately. The fix has been made available, and it is essential to apply the corresponding updates to mitigate the risks associated with this vulnerability.
Vulnerability Details
In more detail, the vulnerability arises from the function mlx5e_netdev_change_profile, which encounters issues when handling profile changes. Should a failure occur while attempting to attach a new profile or roll back to a previous one, the system may end up with a dangling net device, leading to subsequent attempts to access invalid memory. The system crash occurs when the invalid pointer is dereferenced.
The vulnerability has been classified under CWE-476, which pertains to NULL Pointer Dereference. This classification indicates that the vulnerability’s root cause is a lack of sufficient validation of pointers during the operation.
The affected product is the Linux kernel, specifically versions 5.12 through 6.12.67 and 6.13 through 6.18.7, including several release candidates of version 6.19.
The publication date of the vulnerability is January 25, 2026, and it signifies a critical update for systems running the affected Linux kernel versions.
Technical Analysis
The root cause of this vulnerability lies in the improper management of network device profiles within the Linux kernel. The attack vector is local, as the vulnerability can only be exploited by an attacker with low privileges on the system. The complexity of the attack is low, as it relies on the ability to trigger the profile change process.
Privileges required for exploitation are low; however, the user does not need to interact with the system to trigger the vulnerability. The impact on confidentiality and integrity is none, but the availability impact is classified as high due to the system crash that can result from a failed profile change.
Risk & Impact Analysis
The real-world risk of this vulnerability primarily revolves around service disruptions. Organizations that depend heavily on Linux kernel networking functionalities may find their systems vulnerable to crashes, which could lead to downtime and loss of productivity. The blast radius is significant, as a successful exploitation could affect multiple services relying on the kernel's networking stack.
The urgency for remediation is medium, as the CVSS score indicates that while it is not the most severe, the potential for system crashes warrants prompt attention. Organizations should evaluate their deployment scenarios and the likelihood of encountering this vulnerability in their specific environments.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of the Linux kernel are vulnerable to CVE-2026-23000: 5.12 to 6.12.67, 6.13 to 6.18.7, and multiple release candidates of version 6.19.
Mitigation & Remediation
To remediate this vulnerability, organizations should apply the latest patches provided by Linux. Specific patches addressing this issue can be found in the following references:
For detailed patch information, refer to the patches available at the following links:
Organizations should also consider implementing network controls to limit access to affected systems, as well as monitoring for any abnormal behavior that may indicate an attempt to exploit this vulnerability.
Detection Guidance
To detect potential exploitation attempts or anomalies related to this vulnerability, organizations should monitor logs for indicators such as failed profile changes, system crashes, or any unexpected behavior during network operations.
Behavioral anomalies related to network device management should be flagged for further investigation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-23000 lies in its reflection of ongoing challenges in kernel stability and network management. The pattern this vulnerability represents highlights the necessity for robust testing and validation of network functionalities within the kernel.
Security teams should take this as a reminder to prioritize thorough testing in updates and changes to critical components like the kernel. Regular audits and testing should be a part of any security strategy, and organizations should consider adopting a proactive approach to vulnerability management.
For further insights into improving security posture, organizations can explore resources related to penetration testing and other security best practices.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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