In the Linux kernel, a significant vulnerability has been identified regarding the management of the ring buffer, specifically related to the synchronization of IRQ work before the buffer's destruction. This vulnerability, designated as CVE-2023-53587, has been classified as high severity with a CVSS score of 7.8. The implications of this issue could allow attackers to cause system crashes or exploit the system in various ways.
The vulnerability arises when data is written to the ring buffer right before its destruction. Under certain conditions, including during testing scenarios like ARCH=um with time-travel, it is possible to destroy the ring buffer before the IRQ work has completed. This can lead to a use-after-free condition, as documented in a KASAN report, potentially causing crashes or unexpected behavior in the system.
Risk to organizations includes potential system crashes and unauthorized access, which could compromise the integrity and confidentiality of sensitive information. Therefore, organizations should prioritize patching immediately.
As of now, there is no confirmed public exploit available, but the vulnerability has been analyzed, and a patch has been released. Organizations running affected versions of the Linux kernel should take immediate action to mitigate this risk.
To ensure security and stability, systems should be promptly updated to the latest version that addresses this vulnerability, as outlined in the official patches.
The urgency for defenders to address this vulnerability cannot be overstated, given its potential impact on system stability and security.
Vulnerability Details
CVE-2023-53587 affects the Linux kernel, specifically a flaw in the handling of the ring buffer that can lead to a use-after-free condition. The vulnerability is categorized under CWE-416, indicating a critical weakness in memory management.
The CVSS score of 7.8 indicates high severity, reflecting a local attack vector with low complexity and low privileges required for exploitation. The potential impacts include high confidentiality, integrity, and availability implications, making this a serious concern for any organization relying on the Linux kernel.
Officially published on October 4, 2025, this vulnerability has been categorized as analyzed, and the Linux community has provided patches to rectify this issue.
Technical Analysis
The root cause of CVE-2023-53587 lies in the improper synchronization of IRQ work as it pertains to the destruction of the ring buffer. The handling of this process allows for the possibility of freeing memory that is still in use, resulting in undefined behavior and potential system crashes.
The attack vector is considered local, meaning that an attacker must have local access to the system to exploit this vulnerability. The complexity of the attack is low, allowing for exploitation with minimal effort. The requirements for privileges are also low, which means that any user with basic access could potentially leverage this vulnerability.
User interaction is not required for this vulnerability to be exploited, which increases the risk to organizations. The impacts on confidentiality, integrity, and availability are all rated as high, indicating that successful exploitation could lead to severe consequences for the affected systems.
Risk & Impact Analysis
Organizations running affected versions of the Linux kernel must understand the real-world deployment risks associated with this vulnerability. The potential for system crashes and unauthorized access poses a significant threat to operational integrity and data security.
The blast radius for this vulnerability is extensive, as it affects numerous versions of the Linux kernel across multiple distributions. The urgency assessment, based on its CVSS score and potential for exploitation, indicates that organizations should address this vulnerability in their priority patch cycle.
Failure to promptly remediate this vulnerability could expose organizations to data loss, operational disruptions, and significant reputational damage.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects all versions of the Linux kernel prior to the vendor patch, including the following ranges:
- Versions 3.10 to less than 4.14.315 - Versions 4.15 to less than 4.19.283 - Versions 4.20 to less than 5.4.243 - Versions 5.5 to less than 5.10.180 - Versions 5.11 to less than 5.15.111 - Versions 5.16 to less than 6.1.28 - Versions 6.2 to less than 6.2.15 - Versions 6.3 to less than 6.3.2
Mitigation & Remediation
Organizations are advised to patch the Linux kernel immediately to address this vulnerability. The recommended course of action is to upgrade to the latest stable version of the kernel that includes the relevant fixes.
In the absence of a patch, organizations should consider implementing workarounds such as restricting access to the kernel or enhancing monitoring of system logs for anomalous behavior.
Configuration hardening can also provide additional layers of security. This includes disabling unnecessary services and ensuring that only authorized users have access to critical system functions.
Organizations should also consider engaging in penetration testing to identify any vulnerabilities that may have been overlooked during the remediation process.
Detection Guidance
Monitoring logs for specific indicators of exploitation attempts is crucial. Organizations should look for unusual patterns of memory allocation or system crashes that might indicate attempts to exploit the vulnerability.
Behavioral anomalies in system processes, especially related to IRQ handling, should also be closely monitored. Additionally, establishing network signatures that correspond to known exploits can help in early detection.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-53587 highlights the importance of robust memory management in kernel development. This vulnerability serves as a reminder for security teams to regularly audit their systems for similar weaknesses.
Organizations should reflect on their incident response strategies to ensure they can quickly mitigate such vulnerabilities in the future. The patterns observed with this vulnerability may indicate a trend in kernel vulnerabilities that exploit race conditions and improper memory management.
To stay ahead of threats, security teams are encouraged to adopt comprehensive security practices, including engaging in red teaming exercises that simulate real-world attacks and identify potential vulnerabilities before they can be exploited.
In summary, CVE-2023-53587 is a high-severity vulnerability that must be addressed promptly. Organizations should prioritize patching and consider ongoing security assessments to safeguard their systems.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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