Instruction Handling Vulnerability in Linux Kernel by The Linux Foundation

CVE-2025-68259

What is CVE-2025-68259?

A design flaw within the Linux Kernel allows for improper handling of memory instruction modifications during guest operations. This issue specifically arises in virtualized environments utilizing KVM, where the execution of interrupts—specifically INT3 and INTO instructions—can lead to mismanaged instruction states. If a context switch occurs and the instruction gets altered while a virtual CPU is executing, there’s a risk of the kernel misinterpreting the instruction, which can cause guest kernel panics. This manifests as 'Oops: int3' errors during static branch checks, jeopardizing the stability and security of systems running affected Linux kernels.

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References