CVE-2025-21839

CVE-2025-21839 : Linux kernel KVM/x86 vulnerability where DR6 value for a guest could be stale when a VM-Exit occurs, due to loading guest DR6 inside the core vcpu_run() loop for DR6 while DR0–DR3 are handled outside. The fix moves the conditional loading of the hardware DR6 with the guest’s DR6 ...

CVE-2025-21839 KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Load DR6 with guest value only before entering .vcpurun loop Move the conditional loading of hardware DR6 with the guest's DR6 value out of the core .vcpurun loop to fix a bug where KVM can load hardware with a stale...

CVE-2025-21839 KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Load DR6 with guest value only before entering .vcpurun loop Move the conditional loading of hardware DR6 with the guest's DR6 value out of the core .vcpurun loop to fix a bug where KVM can load hardware with a stale...