libbpf: Possible NULL Pointer Dereference when Destroying Skeleton
Summary
GSD-2022-1002099: libbpf: Fix possible NULL pointer dereference when destroying skeleton. Affects Kernel versions >= d66562fba1ce66975bd61b0786fb8b1810f33caa, < 56722aa77b3bb9b53882182cb424514ed4287198. No fix is published. How to fix ↓
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Background
The libbpf package is a library that provides a high-level interface for interacting with the eBPF (extended Berkeley Packet Filter) subsystem in the Linux kernel. It allows user-space programs to load and interact with eBPF programs, maps, and other related objects. The package is widely used in various applications that leverage eBPF for network filtering, tracing, and performance analysis.
Vulnerability Detail
The vulnerability in libbpf arises from a possible NULL pointer dereference when destroying a skeleton. This vulnerability can be triggered during the cleanup process of a skeleton object, leading to a crash or potential code execution. An attacker may be able to exploit this vulnerability to cause a denial-of-service condition or potentially execute arbitrary code with elevated privileges.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is essential to apply the fix by updating the kernel and libbpf package.
Conclusion
The vulnerability in libbpf that could lead to a NULL pointer dereference when destroying a skeleton object has been identified and fixed in Linux Kernel version v5.10.110. Users are advised to update their kernel and libbpf package to the latest stable versions to mitigate the risk of exploitation. For further support and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
Libbpf is a library that provides a high-level interface for interacting with the eBPF subsystem in the Linux kernel. It allows user-space programs to load and interact with eBPF programs, maps, and other related objects.
eBPF (extended Berkeley Packet Filter) is a virtual machine in the Linux kernel that allows for the execution of custom programs for various purposes, such as network filtering, tracing, and performance analysis.
The vulnerability in libbpf can potentially lead to a crash or code execution when destroying a skeleton object. An attacker may be able to exploit this vulnerability to cause a denial-of-service condition or execute arbitrary code with elevated privileges.
To fix the vulnerability, it is recommended to update the Linux Kernel to version v5.10.110 or later, which includes the necessary fix. Additionally, regularly updating the libbpf package is advised to ensure the latest security patches are applied.
There is no known workaround for this vulnerability. It is crucial to apply the fix by updating the kernel and libbpf package.
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