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Vulnerability · Published May 27, 2026 · Assigned by Linux

CVE-2026-46071KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.1%top 97.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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().

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-46071
Debian:13linux6.12.115-2DEBIAN-CVE-2026-46071
Debian:14linux7.0.4-1DEBIAN-CVE-2026-46071
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-46071
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux7.0.0-27.27UBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-46071
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-aws7.0.0-1008.8UBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-46071
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-azure7.0.0-1010.10UBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-46071
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1009.9UBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-46071
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-gcp7.0.0-1007.7UBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-28.28~24.04.1UBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-ibm7.0.0-1009.9UBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-nvidia7.0.0-1013.13UBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1008.8UBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-46071
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-oracle7.0.0-1007.7UBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-46071
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-raspi7.0.0-1014.14UBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-46071
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-realtime7.0.0-27.27.1UBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-46071
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-46071
Ubuntu:26.04:LTSlinux-riscv7.0.0-27.27.1UBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-46071
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-46071
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-46071

Affected products (as reported)

VendorProductVersions
Linux Linux d20c796ca3709801f8a7fa36e8770a3dd8ebd34e – before b7fefb393a926bdfe445c63b4091185ed7da2733d20c796ca3709801f8a7fa36e8770a3dd8ebd34e – before 165b08d2d1346dce5ed43db65e10f3194b9ae2fed20c796ca3709801f8a7fa36e8770a3dd8ebd34e – before 11d347b7edf5093d69aca72317300798a32bfd6bd20c796ca3709801f8a7fa36e8770a3dd8ebd34e – before a3f0981a5a0e0bd51ad74cc7d9eed32294b24002d20c796ca3709801f8a7fa36e8770a3dd8ebd34e – before 9efe23568806d1cd06f7d146f9b3037b8d585a9fd20c796ca3709801f8a7fa36e8770a3dd8ebd34e – before b53ab5167a81537777ac780bbd93d32613aa3bda
Linux Linux 5.19

References