CVE-2026-45987KVM: nSVM: Sync interrupt shadow to cached vmcb12 after VMRUN of L2
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 – < 0c1f74d8b74d8a31751fb6ea5417e48e02c93b58
- affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 – < 4b44aa1a134e499c4517597118378b308602a16c
- affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 – < e39a77a9b1e17d2d831c304eafac4c41a784a0be
- affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 – < 1709418535a8df95532999d61b03d59975280258
- affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 – < 2f950eeb27af6885416232761700b8820cae0a61
- affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 – < 497f6af9679fc9c6ce2f438e11ed5d51b1aa8297
- affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 – < e0377e52f3c10ee572732d11b04625b7f517a862
- affected cc440cdad5b7a4c1de12dace725209eb3e0cf663 – < 03bee264f8ebfd39e0254c98e112d033a7aa9055
- affected 5.8
- unaffected < 5.8
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.140 – ≤ 6.6.*
- unaffected 6.12.86 – ≤ 6.12.*
- unaffected 6.18.27 – ≤ 6.18.*
- unaffected 7.0.4 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/0c1f74d8b74d8a31751fb6ea5417e48e02c93b58 (opens in a new tab)
- https://git.kernel.org/stable/c/4b44aa1a134e499c4517597118378b308602a16c (opens in a new tab)
- https://git.kernel.org/stable/c/e39a77a9b1e17d2d831c304eafac4c41a784a0be (opens in a new tab)
- https://git.kernel.org/stable/c/1709418535a8df95532999d61b03d59975280258 (opens in a new tab)
- https://git.kernel.org/stable/c/2f950eeb27af6885416232761700b8820cae0a61 (opens in a new tab)
- https://git.kernel.org/stable/c/497f6af9679fc9c6ce2f438e11ed5d51b1aa8297 (opens in a new tab)
- https://git.kernel.org/stable/c/e0377e52f3c10ee572732d11b04625b7f517a862 (opens in a new tab)
- https://git.kernel.org/stable/c/03bee264f8ebfd39e0254c98e112d033a7aa9055 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-32283 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-45987)Record last updated .