CVE-2026-43050 is a newly identified vulnerability in the Linux kernel that has been classified as unresolved. This vulnerability allows for a use-after-free condition, which can lead to serious issues if exploited. The vulnerability arises from a race condition between the clearing of a socket structure and concurrent access to that structure by other threads.
The severity of this vulnerability is currently categorized as unknown, and its CVSS score has not yet been assigned. Nonetheless, the implications of this vulnerability may pose risks to organizations utilizing the Linux kernel in their operations. Timely patching and remediation strategies should be prioritized.
Risk to organizations includes potential disruptions and unauthorized access if the vulnerability is exploited. Even though there are no known exploits at this time, the nature of the vulnerability means that it could be leveraged by attackers in the future. Therefore, organizations should prioritize patching immediately.
As of now, the vulnerability is awaiting analysis, and no public exploit has been confirmed. Organizations should monitor for updates from the Linux kernel development community regarding patches and mitigations.
Vulnerability Details
In the Linux kernel, the following vulnerability has been resolved: atm: lec: fix use-after-free in sock_def_readable(). A race condition exists between lec_atm_close() setting priv->lecd to NULL and concurrent access to priv->lecd in send_to_lecd(), lec_handle_bridge(), and lec_atm_send(). When the socket is freed via RCU while another thread is still using it, a use-after-free occurs in sock_def_readable() when accessing the socket's wait queue.
The root cause is that lec_atm_close() clears priv->lecd without any synchronization, while callers dereference priv->lecd without any protection against concurrent teardown. Fixing this involves converting priv->lecd to an RCU-protected pointer.
The vulnerability has been assigned a CVSS score of 0, thus indicating that it is currently unscored. The vulnerability affects the Linux kernel and was published on May 1, 2026.
Technical Analysis
The root cause of this vulnerability is linked to improper synchronization mechanisms in the management of socket structures. The race condition arises from a lack of safeguards when priv->lecd is set to NULL by lec_atm_close() while other threads may be accessing that pointer.
The attack vector is local, as the vulnerability can only be exploited on systems where an attacker has local access. The complexity of exploitation is considered low, as it requires concurrent access to the affected sockets. No user interaction is required for this vulnerability to be exploited.
The confidentiality, integrity, and availability impacts remain unclear, as the technical details surrounding potential exploitation are still under analysis.
Risk & Impact Analysis
Organizations that deploy the Linux kernel should be aware of the implications of CVE-2026-43050. The unresolved status of this vulnerability highlights the importance of maintaining a proactive security posture. The potential for exploitation, though currently low, could increase as the vulnerability becomes more widely known. Risk to organizations includes disruption of services and unauthorized access to sensitive data.
Given its low EPSS score of 0.000240000, indicating a low probability of exploitation, organizations should still treat this vulnerability seriously and monitor for any updates or patches from the Linux kernel community. Organizations should address in priority patch cycle.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
As the specific affected versions are not detailed in the current analysis, organizations are advised to consider all versions of the Linux kernel prior to any upcoming patches.
Mitigation & Remediation
Organizations should monitor the Linux kernel community for updates regarding patches. It is essential to prioritize the implementation of those patches as they become available. Additionally, organizations can enhance their security posture by implementing network controls and monitoring systems for unusual activity.
Penetration testing can also be used to identify any similar vulnerabilities in the existing infrastructure.
Detection Guidance
Organizations should maintain logs of system changes and monitor for any behavioral anomalies that could indicate exploitation attempts. Additionally, they should implement network signatures to detect unusual traffic patterns related to socket operations.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-43050 lies in its potential to highlight weaknesses in the Linux kernel's handling of socket structures. Security teams should consider this as part of broader risk assessments and vulnerability management programs.
This vulnerability reinforces the need for ongoing security education, especially concerning concurrency issues and synchronization practices in software development. Organizations can benefit from reviewing their development practices to mitigate similar vulnerabilities.
Vulnerability management programs are essential for proactively identifying and mitigating risks across systems.
Effective penetration testing methodologies can also aid in identifying potential weaknesses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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