Critical Race Condition in Linux Kernel's Interconnect Management
Summary
DEBIAN-CVE-2024-27005: In the Linux kernel, the following vulnerability has been resolved: interconnect: Don't access req_list while it's being manipulated The icc_lock mutex was split into separate icc_lock and icc_bw_lock mutexes in [1] to a... Affects linux versions < 6.8.9-1. Fixed in 6.8.9-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to applications. It is widely used in various environments, from servers to embedded systems. The kernel's interconnect management subsystem facilitates communication between different components, ensuring efficient data transfer. However, a recent vulnerability has been identified that compromises the integrity of this subsystem, specifically concerning the handling of request lists.
Vulnerability Detail
In the Linux kernel, a race condition exists due to improper locking mechanisms in the interconnect management subsystem. The icc_lock and icc_bw_lock mutexes were introduced to manage access to shared resources, but they do not adequately protect the icc_node::req_list during concurrent operations. This flaw can lead to invalid pointer dereferences, potentially causing system crashes or unpredictable behavior. The vulnerability arises from the icc_set_bw() function, which iterates over req_list while only holding icc_bw_lock, allowing req_list to be modified concurrently, leading to race conditions.
How To Fix
Minimum fixed version
6.8.9-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds provided for this vulnerability. It is recommended to apply the patch as soon as it is available to mitigate the risks associated with this race condition.
Conclusion
The identified vulnerability in the Linux kernel's interconnect management subsystem poses significant risks due to a race condition that can lead to system instability. It is essential for users to update their systems to the patched version 6.8.9-1 or later to mitigate these risks. Regular monitoring for vulnerabilities using tools like Vulert can help maintain system security.
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FAQ
The vulnerability is a race condition in the Linux kernel's interconnect management subsystem, leading to potential crashes or unpredictable behavior.
The vulnerability affects all versions prior to 6.8.9-1 in Debian 13 and 14.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
While there are no specific workarounds, it is crucial to prioritize updating to the patched version to avoid potential risks.
Detailed information can be found in the Debian CVE database at https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2024-27005.json.
References
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