CVE-2023-53348 is a medium-severity vulnerability in the Linux kernel. This vulnerability allows deadlocks when aborting transactions during the relocation of block groups, especially during scrub operations. The deadlock occurs when the scrub is paused while a transaction is being committed, leading to potential system instability.
The CVSS score for this vulnerability is 5.5, indicating a medium severity level. The exploitation of this vulnerability might not be immediate, but it poses a risk to organizations that rely on the Linux kernel for critical operations. Thus, organizations should prioritize patching immediately.
The urgency for defenders is high as the risk can manifest in deadlocks, causing significant interruptions in system operations. Organizations should evaluate their environments and take proactive measures to mitigate this risk.
Understanding the real-world implications of this vulnerability is crucial. Affected systems may face transaction failures which could lead to data integrity issues and service downtime.
Vulnerability Details
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix deadlock when aborting transaction during relocation with scrub.
Before relocating a block group, the scrub is paused, then the relocation is performed, and the scrub is unpaused. If a failure occurs in the critical section of the transaction commit path with a paused scrub, a deadlock will occur.
This vulnerability has a CVSS score of 5.5, classified as medium severity. The affected products include various versions of the Linux kernel, specifically versions prior to 6.1.23 and between 6.2 and 6.2.10.
The publication date of this vulnerability is September 17, 2025, and it has been classified under CWE-667.
Technical Analysis
The root cause of this vulnerability lies in the transaction management system of the Linux kernel. Specifically, it occurs when a block group relocation is initiated while a scrub operation is paused. The transaction must be started and committed successfully, but if an error arises during this critical phase, a deadlock can ensue.
The attack vector for this vulnerability is local, requiring low attack complexity and low privileges. No user interaction is necessary to exploit it. The availability impact is high, meaning that successful exploitation can lead to significant system disruptions.
This vulnerability highlights the importance of effective transaction handling in system operations. Monitoring these transactions and ensuring that scrubs do not overlap with critical operations is essential to mitigate the risk.
Risk & Impact Analysis
Risk to organizations includes service interruptions and potential data integrity issues. The blast radius of this vulnerability could be significant, particularly for organizations that rely on the Linux kernel for critical infrastructure.
Organizations should assess their environments for vulnerable kernel versions and prioritize updating to the latest stable release to mitigate potential risks.
Given the medium CVSS score of 5.5, organizations should address this vulnerability in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include all Linux kernel versions prior to 6.1.23 and from 6.2 up to, but not including, 6.2.10. Additionally, versions 6.3-rc1, 6.3-rc2, 6.3-rc3, and 6.3-rc4 are also affected.
Mitigation & Remediation
Organizations should prioritize patching immediately. The patches are available in the Linux kernel repository, and organizations are encouraged to upgrade to the latest stable version.
For those unable to apply patches, consider adjusting system configurations to minimize the risk of deadlocks during transaction processes.
Detection Guidance
Monitor system logs for transaction failures or warnings related to the BTRFS subsystem. Additionally, observe for any abnormal behavior during block group relocation processes.
AppSecure Threat Intelligence Insight
This vulnerability reflects ongoing challenges in transaction management within the Linux kernel. It serves as a reminder for organizations to maintain robust monitoring and patch management strategies.
Security teams should leverage resources such as penetration testing to identify similar vulnerabilities proactively.
Additionally, organizations should develop a comprehensive vulnerability management program to ensure timely responses to emerging threats.
Lastly, understanding the patterns of kernel vulnerabilities can help organizations anticipate potential risks. Engaging with resources such as penetration testing methodology can provide insights into effective remediation strategies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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