Answer in brief
CVE-2026-45987 records a Unknown severity vulnerability in KVM: nSVM: Sync interrupt shadow to cached vmcb12 after VMRUN of L2. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cc440cdad5b7a4c1de12dace725209eb3e0cf663 <0c1f74d8b74d8a31751fb6ea5417e48e02c93b58 || >=cc440cdad5b7a4c1de12dace725209eb3e0cf663 <4b44aa1a134e499c4517597118378b308602a16c || >=cc440cdad5b7a4c1de12dace725209eb3e0cf663 <e39a77a9b1e17d2d831c304eafac4c41a784a0be || >=cc440cdad5b7a4c1de12dace725209eb3e0cf663 <1709418535a8df95532999d61b03d59975280258 || >=cc440cdad5b7a4c1de12dace725209eb3e0cf663 <2f950eeb27af6885416232761700b8820cae0a61 || >=cc440cdad5b7a4c1de12dace725209eb3e0cf663 <497f6af9679fc9c6ce2f438e11ed5d51b1aa8297 || >=cc440cdad5b7a4c1de12dace725209eb3e0cf663 <e0377e52f3c10ee572732d11b04625b7f517a862 || >=cc440cdad5b7a4c1de12dace725209eb3e0cf663 <03bee264f8ebfd39e0254c98e112d033a7aa9055 | 0c1f74d8b74d8a31751fb6ea5417e48e02c93b58, 4b44aa1a134e499c4517597118378b308602a16c, e39a77a9b1e17d2d831c304eafac4c41a784a0be, 1709418535a8df95532999d61b03d59975280258, 2f950eeb27af6885416232761700b8820cae0a61, 497f6af9679fc9c6ce2f438e11ed5d51b1aa8297, e0377e52f3c10ee572732d11b04625b7f517a862, 03bee264f8ebfd39e0254c98e112d033a7aa9055 |
| Linux/Linuxgeneric | 5.8 | Not reported |
Published upstream
May 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 6, 2026
In 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.
Quoted source text, attributed separately from HOL analysis.