Use-After-Free Vulnerability in Linux Kernel CIFS Client
Summary
CVE-2024-53095: In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix use-after-free of network namespace. Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. 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 management. The CIFS (Common Internet File System) client allows for file sharing over the network, enabling seamless access to files on remote servers. This vulnerability arises from improper reference counting in the network namespace, which can lead to system instability and crashes during specific operations.
Vulnerability Detail
In the Linux kernel, a use-after-free vulnerability has been identified in the CIFS client. This issue occurs when the CIFS client fails to properly manage the reference count of the network namespace associated with kernel sockets. As a result, when a socket is freed while its network namespace is still in use, it can lead to a crash (oops) during reconnection attempts to a server. This vulnerability is particularly problematic in Kubernetes environments where CIFS mounts are used in non-root network namespaces, making it difficult to predict when the issue may occur.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, avoid using CIFS mounts in non-root network namespaces until the system can be updated with the patched version. Additionally, consider implementing network policies that minimize the risk of dropping packets in these namespaces.
Conclusion
The CVE-2024-53095 vulnerability in the Linux kernel's CIFS client poses significant risks, particularly in Kubernetes environments. Proper reference counting is crucial to prevent use-after-free errors that can lead to system instability. Users are advised to update their systems to the patched version to mitigate these risks.
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FAQ
A use-after-free vulnerability occurs when a program continues to use a memory location after it has been freed, potentially leading to crashes or arbitrary code execution.
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The consequences include system crashes, data loss, and potential exploitation by malicious actors if the vulnerability is leveraged.
Yes, this vulnerability is more likely to occur in Kubernetes environments where CIFS mounts are used in non-root network namespaces.
If immediate updates are not possible, consider using workarounds such as avoiding CIFS mounts in non-root namespaces and implementing strict network policies.
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