CVE-2025-40300

The CVE-2025-40300 issue affects the Linux kernel’s x86/vmscape mitigation. The vulnerability arises from insufficient branch predictor isolation between a guest and a userspace hypervisor, which is mitigated by conditionally issuing an IBPB after VMexit and before returning to userspace. The fix...

Linux Distros Unpatched Vulnerability : CVE-2025-21839

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

kernel: xen: svm: insufficiencies in handling emulated instructions during vm exits

The instruction emulation in Xen 3.0.3 allows local SMP guest users to cause a denial of service host crash by replacing the instruction that causes the VM to exit in one thread with a different instruction in a different thread...