Critical Locking Vulnerability in Linux Kernel Package: CVE-2024-49980
Summary
DEBIAN-CVE-2024-49980: In the Linux kernel, the following vulnerability has been resolved: vrf: revert "vrf: Remove unnecessary RCU-bh critical section" This reverts commit 504fc6f4f7f681d2a03aa5f68aad549d90eab853. Affects linux versions < 6.11.4-1. Fixed in 6.11.4-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It is known for its robustness and flexibility, supporting a wide range of devices and applications. However, vulnerabilities can arise, affecting system stability and security. CVE-2024-49980 specifically addresses an issue related to the vrf (Virtual Routing and Forwarding) functionality, which is critical for network operations.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified that involves the vrf component. This issue stems from a reverted commit that removed necessary RCU-bh (Read-Copy-Update with bottom half) critical section protections. As a result, the function dev_queue_xmit_nit may be called with BH disabled, leading to inconsistent lock states and potential deadlocks. This vulnerability can trigger lockdep warnings and may cause system instability, particularly in network operations where vrf is utilized.
How To Fix
Minimum fixed version
6.11.4-1
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 mentioned for this vulnerability. It is recommended to apply the patch as soon as it is available to mitigate any risks associated with the vulnerability.
Conclusion
CVE-2024-49980 is a critical vulnerability in the Linux kernel that affects the vrf functionality, leading to potential system instability. It is crucial for users to update their kernel to the patched version (6.11.4-1) to safeguard their systems. Monitoring tools like Vulert can assist in identifying vulnerabilities in open-source software.
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FAQ
CVE-2024-49980 is a vulnerability in the Linux kernel related to the vrf functionality, which can lead to inconsistent lock states and potential deadlocks.
This vulnerability can cause system instability, particularly in network operations, leading to warnings and possible deadlocks.
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 by this vulnerability.
While there are no specific workarounds, it is advisable to prioritize updating your kernel to the patched version as soon as possible to mitigate risks.
Detailed information about CVE-2024-49980 can be found in the official Debian security advisories and the Linux kernel documentation.
References
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