Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails Re-pend GET_NESTED_STATE_PAGES before exiting to userspace if getting the nested pages fails in the KVM_RUN path. If userspace re-runs the vCPU, and vmcs02 holds valid PFNs from the *previous* run of L2, then KVM could re-enter L2 with stale, unpinned PFNs mapped into e.g. the vAPIC page. Note, both SVM and VMX (as of commit 11722439fb20 ("KVM: nVMX: Ensure KVM_REQ_GET_NESTED_STATE_PAGES is cleared on VM-Exit") ensure the request is cleared on VM-Exit (including the "forced" case), i.e. there is no risk of double-mapping due to emulated VMLAUNCH/VMRESUME/VMRUN *and* the request trying to map the nested pages.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 671ddc700fd08b94967b1e2a937020e30c838609 before 525694a6021ec6c8f7ce1f38acdf2dd77698fec1; affected 671ddc700fd08b94967b1e2a937020e30c838609 before 942192dbcd3a06695ef6b31cf10a41a21cf014d8; affected 671ddc700fd08b94967b1e2a937020e30c838609 before 10180a277549339020b08000206092c07e0bff5a |
| Linux / Linux | affected 5.4; unaffected 0 before 5.4; unaffected 6.18.56 through 6.18.*; unaffected 7.2.10 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.