KVM: nSVM: Sync interrupt shadow to cached vmcb12 after VMRUN of L2

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-45987
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:16 UTC
Updated2026-06-01 17:17:15 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Sync interrupt shadow to cached vmcb12 after VMRUN of L2 After VMRUN in guest mode, nested_sync_control_from_vmcb02() syncs fields written by the CPU from vmcb02 to the cached vmcb12. This is because the cached vmcb12 is used as the authoritative copy of some of the controls, and is the payload when saving/restoring nested state. int_state is also written by the CPU, specifically bit 0 (i.e. SVM_INTERRUPT_SHADOW_MASK) for nested VMs, but it is not sync'd to cached vmcb12. This does not cause a problem if KVM_SET_NESTED_STATE preceeds KVM_SET_VCPU_EVENTS in the restore path, as an interrupt shadow would be correctly restored to vmcb02 (KVM_SET_VCPU_EVENTS overwrites what KVM_SET_NESTED_STATE restored in int_state). However, if KVM_SET_VCPU_EVENTS preceeds KVM_SET_NESTED_STATE, an interrupt shadow would be restored into vmcb01 instead of vmcb02. This would mostly be benign for L1 (delays an interrupt), but not for L2. For L2, the vCPU could hang (e.g. if a wakeup interrupt is delivered before a HLT that should have been in an interrupt shadow). Sync int_state to the cached vmcb12 in nested_sync_control_from_vmcb02() to avoid this problem. With that, KVM_SET_NESTED_STATE restores the correct interrupt shadow state, and if KVM_SET_VCPU_EVENTS follows it would overwrite it with the same value.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.050770000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 0c1f74d8b74d8a31751fb6ea5417e48e02c93b58 git Not specified
CNA Linux Linux affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 4b44aa1a134e499c4517597118378b308602a16c git Not specified
CNA Linux Linux affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 e39a77a9b1e17d2d831c304eafac4c41a784a0be git Not specified
CNA Linux Linux affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 1709418535a8df95532999d61b03d59975280258 git Not specified
CNA Linux Linux affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 2f950eeb27af6885416232761700b8820cae0a61 git Not specified
CNA Linux Linux affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 497f6af9679fc9c6ce2f438e11ed5d51b1aa8297 git Not specified
CNA Linux Linux affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 e0377e52f3c10ee572732d11b04625b7f517a862 git Not specified
CNA Linux Linux affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 03bee264f8ebfd39e0254c98e112d033a7aa9055 git Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 5.8 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4b44aa1a134e499c4517597118378b308602a16c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1709418535a8df95532999d61b03d59975280258 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/03bee264f8ebfd39e0254c98e112d033a7aa9055 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/497f6af9679fc9c6ce2f438e11ed5d51b1aa8297 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2f950eeb27af6885416232761700b8820cae0a61 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e39a77a9b1e17d2d831c304eafac4c41a784a0be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e0377e52f3c10ee572732d11b04625b7f517a862 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0c1f74d8b74d8a31751fb6ea5417e48e02c93b58 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report