Critical Null Pointer Dereference in Linux Kernel - CVE-2023-53469
Summary
DEBIAN-CVE-2023-53469: In the Linux kernel, the following vulnerability has been resolved: af_unix: Fix null-ptr-deref in unix_stream_sendpage(). 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 interaction. It is responsible for managing system resources, enabling communication between hardware and applications. The kernel is known for its stability and performance, but vulnerabilities can pose significant risks to system integrity and security. CVE-2023-53469 highlights a critical issue within the kernel's handling of Unix domain sockets, specifically in the 'unix_stream_sendpage()' function, which can lead to severe system crashes or exploitation.
Vulnerability Detail
CVE-2023-53469 is a vulnerability in the Linux kernel that allows for a null pointer dereference in the 'unix_stream_sendpage()' function. This issue arises when the function attempts to add data to the last socket buffer (skb) in the peer's receive queue without proper locking mechanisms. If a socket's file descriptor (FD) is passed to another socket and both sockets are closed without receiving the FD, garbage collection can occur, leading to a race condition. This race condition allows 'unix_stream_sendpage()' to access an skb that is being released, resulting in a use-after-free scenario. The vulnerability can lead to system crashes, data corruption, or potential exploitation by attackers.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, consider avoiding the use of Unix domain sockets in scenarios where file descriptors are shared between sockets. This can help mitigate the risk of triggering the vulnerability until a proper patch is applied.
Conclusion
CVE-2023-53469 represents a significant vulnerability in the Linux kernel that can lead to serious system instability and potential exploitation. It is crucial for users and administrators to apply the necessary updates to mitigate risks associated with this issue. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
CVE-2023-53469 is a vulnerability in the Linux kernel that can lead to a null pointer dereference, potentially causing system crashes or exploitation.
If your system is running a vulnerable version of the Linux kernel, it may be susceptible to crashes or exploitation, especially in environments using Unix domain sockets.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected by this vulnerability.
If immediate updates are not possible, consider implementing workarounds such as avoiding the use of Unix domain sockets in critical applications.
Detailed information about CVE-2023-53469 can be found in security advisories from your Linux distribution and on vulnerability databases.
References
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