Vulnerability in xen/netfront package: destroy queues before real_num_tx_queues is zeroed
Summary
GSD-2022-1000779: xen/netfront: destroy queues before real_num_tx_queues is zeroed. Affects Kernel versions >= 0abd3f9903fae6ecf8db3c89a459971fe7925499, < a63eb1e4a2e1a191a90217871e67fba42fd39255. No fix is published. How to fix ↓
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Background
The xen/netfront package is a component of the Linux Kernel that provides network front-end drivers for Xen virtualization. It allows virtual machines to communicate with the physical network interface. The package includes functionality for creating and managing transmit queues for network packets. However, a vulnerability has been discovered in the package where the queues are not properly destroyed before the real_num_tx_queues variable is zeroed.
Vulnerability Detail
The vulnerability in xen/netfront arises from a failure to destroy transmit queues before zeroing the real_num_tx_queues variable. This can lead to a use-after-free condition, where the queues may still be accessed after they have been freed. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service by manipulating the freed queues. The vulnerability was introduced in Linux Kernel version v5.15.17 and has been fixed in version v5.15.27.
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 recommended to apply the fix by updating the Linux Kernel to the latest version.
Conclusion
The vulnerability in xen/netfront package, which allows for the destruction of queues before zeroing the real_num_tx_queues variable, can lead to a use-after-free condition. This vulnerability has been fixed in Linux Kernel version v5.15.27. It is recommended to update the Linux Kernel to the latest version to mitigate any potential risks. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability could allow an attacker to execute arbitrary code or cause a denial-of-service by manipulating freed transmit queues.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and Vulert will analyze it for any open-source vulnerabilities, including this one.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the fix as soon as possible to mitigate any potential risks.
Yes, this vulnerability can be exploited remotely if the affected system is exposed to the network. Attackers can send specially crafted network packets to trigger the use-after-free condition and potentially execute arbitrary code.
There are no reported incidents related to this vulnerability at the time of this report. However, it is advisable to apply the fix to prevent any potential exploitation.
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