Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xen: speed up grant-table reclaim When a grant entry is still in use by the remote domain, Linux must put it on a deferred list. Normally, this list is very short, because the PV network and block protocols expect the backend to unmap the grant first. However, Qubes OS's GUI protocol is subject to the constraints of the X Window System, and as such winds up with the frontend unmapping the window first. As a result, the list can grow very large, resulting in a massive memory leak and eventual VM freeze. To partially solve this problem, make the number of entries that the VM will attempt to free at each iteration tunable. The default is still 10, but it can be overridden via a module parameter. This is Cc: stable because (when combined with appropriate userspace changes) it fixes a severe performance and stability problem for Qubes OS users.
References
- https://git.kernel.org/stable/c/c04e9894846c663f3278a414f34416e6e45bbe68
- https://git.kernel.org/stable/c/c76d96c555895ac602c1587b001e5cf656abc371
- https://git.kernel.org/stable/c/cd1a8952ff529adc210e62306849fd6f256608c0
FAQ
What is CVE-2023-54081?
CVE-2023-54081 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: xen: speed up grant-table reclaim When a grant entry is still in use by the remote domain, Linux must put it on a deferred list. ...
How severe is CVE-2023-54081?
CVSS scoring is not yet available for CVE-2023-54081. Check NVD for updates.
Is there a patch for CVE-2023-54081?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.