CVE-2026-46071KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12 svm_copy_lbrs() always marks VMCB_LBR dirty in the destination VMCB. However, nested_svm_vmexit() uses it to copy LBRs to vmcb12, and clearing clean bits in vmcb12 is not architecturally defined. Move vmcb_mark_dirty() to callers and drop it for vmcb12. This also facilitates incoming refactoring that does not pass the entire VMCB to svm_copy_lbrs().
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Undergoing Analysis
- Record last updated
- Oct 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from d20c796ca3709801f8a7fa36e8770a3dd8ebd34e before 165b08d2d1346dce5ed43db65e10f3194b9ae2fe; from d20c796ca3709801f8a7fa36e8770a3dd8ebd34e before 11d347b7edf5093d69aca72317300798a32bfd6b; from d20c796ca3709801f8a7fa36e8770a3dd8ebd34e before a3f0981a5a0e0bd51ad74cc7d9eed32294b24002; from d20c796ca3709801f8a7fa36e8770a3dd8ebd34e before 9efe23568806d1cd06f7d146f9b3037b8d585a9f; from d20c796ca3709801f8a7fa36e8770a3dd8ebd34e before b53ab5167a81537777ac780bbd93d32613aa3bda | CNA record |
linux linux_kernel linux:linux_kernel | from 5.19 before 6.18.27; from 6.19 before 7.0.4 | NVD |
References
- https://git.kernel.org/stable/c/165b08d2d1346dce5ed43db65e10f3194b9ae2fe
- https://git.kernel.org/stable/c/11d347b7edf5093d69aca72317300798a32bfd6b
- https://git.kernel.org/stable/c/a3f0981a5a0e0bd51ad74cc7d9eed32294b24002patch
- https://git.kernel.org/stable/c/9efe23568806d1cd06f7d146f9b3037b8d585a9fpatch
- https://git.kernel.org/stable/c/b53ab5167a81537777ac780bbd93d32613aa3bdapatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.