Critical Vulnerability in Linux Kernel: CVE-2019-16089
Summary
DEBIAN-CVE-2019-16089: An issue was discovered in the Linux kernel through 5.2.13. nbd_genl_status in drivers/block/nbd.c does not check the nla_nest_start_noflag return value. 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 the Linux operating system, responsible for managing hardware resources and providing essential services to software applications. It is widely used across various platforms, from servers to embedded devices. The kernel's stability and security are paramount, as vulnerabilities can lead to system compromises and data breaches. CVE-2019-16089 is a significant issue that affects multiple Debian versions of the Linux kernel.
Vulnerability Detail
CVE-2019-16089 is a vulnerability found in the Linux kernel up to version 5.2.13. The issue arises from the function nbd_genl_status in the file drivers/block/nbd.c, which fails to properly check the return value of nla_nest_start_noflag. This oversight can lead to potential denial of service or other security implications, as it may allow an attacker to exploit this flaw to manipulate kernel behavior, potentially leading to system instability or unauthorized access.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can limit access to the affected services or restrict the use of the nbd (Network Block Device) functionality until the system is updated to a secure version. This can be done by modifying firewall rules or disabling the nbd service.
Conclusion
CVE-2019-16089 poses a significant risk to systems running affected versions of the Linux kernel. It is crucial for users to update their systems to patched versions to ensure security and stability. Utilizing tools like Vulert can help monitor for such vulnerabilities in real-time.
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FAQ
CVE-2019-16089 is a vulnerability in the Linux kernel that can lead to potential denial of service or security breaches due to improper checks in the nbd_genl_status function.
You can check if your system is affected by using the Vulert playground at Vulert Scanner, which allows you to monitor and alert for open-source vulnerabilities without requiring installation.
Debian versions 11, 12, 13, and 14 are affected by CVE-2019-16089, specifically those using the Linux kernel up to version 5.2.13.
Yes, a patch is available in the updated versions of the Linux kernel. Users should upgrade to a version above 5.2.13 to mitigate the risk.
If immediate updates are not possible, consider implementing temporary workarounds such as restricting access to affected services or disabling the nbd functionality.
References
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