5.5

CVE-2022-48793

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.13 < 5.15.25
Linux ≫ Linux Kernel Version >= 5.16 < 5.16.11
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.24% 0.146
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/352193edda48e08e8824a7ece09aec830a603cfe
Patch
https://git.kernel.org/stable/c/74b426bea4f7e3b081add2b88d4fba16d3af7ab6
Patch
https://git.kernel.org/stable/c/e1779c2714c3023e4629825762bcbc43a3b943df
Patch