{"id":"CVE-2026-98863","title":"KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails\n\nRe-pend GET_NESTED_STATE_PAGES before exiting to userspace if getting the\nnested pages fails in th…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 < 525694a6021ec6c8f7ce1f38acdf2dd77698fec1","Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 < 942192dbcd3a06695ef6b31cf10a41a21cf014d8","Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 < 10180a277549339020b08000206092c07e0bff5a","Linux 5.4"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:51:24.446Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98863","references":[{"url":"https://git.kernel.org/stable/c/525694a6021ec6c8f7ce1f38acdf2dd77698fec1"},{"url":"https://git.kernel.org/stable/c/942192dbcd3a06695ef6b31cf10a41a21cf014d8"},{"url":"https://git.kernel.org/stable/c/10180a277549339020b08000206092c07e0bff5a"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.458Z","slug":"CVE-2026-98863","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails\n\nRe-pend GET_NESTED_STATE_PAGES before exiting to userspace if getting the\nnested pages fails in the KVM_RUN path.  If userspace re-runs the vCPU, and\nvmcs02 holds valid PFNs from the *previous* run of L2, then KVM could\nre-enter L2 with stale, unpinned PFNs mapped into e.g. the vAPIC page.\n\nNote, both SVM and VMX (as of commit 11722439fb20 (\"KVM: nVMX: Ensure\nKVM_REQ_GET_NESTED_STATE_PAGES is cleared on VM-Exit\") ensure the request\nis cleared on VM-Exit (including the \"forced\" case), i.e. there is no risk\nof double-mapping due to emulated VMLAUNCH/VMRESUME/VMRUN *and* the request\ntrying to map the nested pages.\n\n## Affected\n\n- `Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 < 525694a6021ec6c8f7ce1f38acdf2dd77698fec1`\n- `Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 < 942192dbcd3a06695ef6b31cf10a41a21cf014d8`\n- `Linux >= 671ddc700fd08b94967b1e2a937020e30c838609 < 10180a277549339020b08000206092c07e0bff5a`\n- `Linux 5.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}