CVE-2022-48793

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux232f75d3b4b5456de6f0b671aa86345d62de1473 < 74b426bea4f7e3b081add2b88d4fba16d3af7ab6affected
LinuxLinux232f75d3b4b5456de6f0b671aa86345d62de1473 < 352193edda48e08e8824a7ece09aec830a603cfeaffected
LinuxLinux232f75d3b4b5456de6f0b671aa86345d62de1473 < e1779c2714c3023e4629825762bcbc43a3b943dfaffected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux5.15.25 <= 5.15.*unaffected
LinuxLinux5.16.11 <= 5.16.*unaffected
LinuxLinux5.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References