CVE-2022-48793

KVM: x86: nSVM: fix potential NULL derefernce on nested migration

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: nSVM: fix potential NULL derefernce on nested migration Turns out that due to review feedback and/or rebases I accidentally moved the call to nested_svm_load_cr3 to be too early, before the NPT is enabled, which is very wrong to do. KVM can't even access guest memory at that point as nested NPT is needed for that, and of course it won't initialize the walk_mmu, which is main issue the patch was addressing. Fix this for real.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/74b426bea4f7e3b081add2b88d4fba16d3af7ab6 patch
https://git.kernel.org/stable/c/352193edda48e08e8824a7ece09aec830a603cfe patch
https://git.kernel.org/stable/c/e1779c2714c3023e4629825762bcbc43a3b943df patch

Frequently Asked Questions

What is the severity of CVE-2022-48793?
CVE-2022-48793 has been scored as a medium severity vulnerability.
How to fix CVE-2022-48793?
To fix CVE-2022-48793, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-48793 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2022-48793 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-48793?
CVE-2022-48793 affects Linux Linux, Linux Linux.
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