Vulnerability in xen/xenbus package: Removal of Grants in Error Case
Summary
GSD-2022-1000758: xen/xenbus: don't let xenbus_grant_ring() remove grants in error case. Affects Kernel versions < 66cb2bbb522b0d5e4f6a11558ff7bfdf3f7d31f3. No fix is published. How to fix ↓
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Background
The xen/xenbus package is a component of the Linux Kernel ecosystem. It provides a mechanism for communication between the Xen hypervisor and guest domains. The package allows guest domains to request resources from the hypervisor and share information. The xenbus_grant_ring() function is responsible for granting access to shared memory rings between the hypervisor and guest domains. However, a vulnerability has been discovered in this function that could lead to the unintended removal of grants in an error case.
Vulnerability Detail
The vulnerability in xen/xenbus arises from the xenbus_grant_ring() function, which incorrectly removes grants in an error case. This can result in the loss of shared memory rings between the hypervisor and guest domains. An attacker could potentially exploit this vulnerability to disrupt communication between the hypervisor and guest domains, leading to denial of service or other security implications. The vulnerability has been fixed in Linux Kernel version v5.15.28 by commit 66cb2bbb522b0d5e4f6a11558ff7bfdf3f7d31f3.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
In conclusion, the xen/xenbus package in the Linux Kernel is vulnerable to a flaw that can result in the unintended removal of grants in an error case. This can disrupt communication between the hypervisor and guest domains, leading to potential denial of service or other security implications. It is recommended to update the Linux Kernel to version v5.15.28 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to the loss of shared memory rings between the hypervisor and guest domains, potentially disrupting communication and causing denial of service or other security implications.
At the time of this report, there is no known exploit for this vulnerability. However, it is advisable to apply the recommended fix to mitigate any potential risks.
The vulnerability is present in versions of the xen/xenbus package prior to Linux Kernel v5.15.28. It has been fixed in this version and subsequent releases.
The recommended fix for this vulnerability is to update the Linux Kernel to version v5.15.28 or later. While there may be alternative mitigation measures, updating the kernel is the most effective way to address the vulnerability.
More information about the fix can be found in the commit 66cb2bbb522b0d5e4f6a11558ff7bfdf3f7d31f3 in the official Linux Kernel repository. The vulnerability details are available in the Open Source Vulnerability database with ID GSD-2022-1000758.
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