Linux Kernel Vulnerability in QEMU VMware Mouse Emulation
CVE-2026-23215

Currently unrated

Key Information:

Vendor: Linux
Status: Linux
Vendor: CVE Published:; 18 February 2026

What is CVE-2026-23215?

A vulnerability within the Linux kernel's handling of VMware hypercalls has been identified, particularly affecting the QEMU VMware mouse emulation. This issue arises due to the improper handling of the %rdi register, where a bug in the QEMU vmmouse driver causes the upper 32 bits of %rdi to be cleared. This leads to page faults when dereferencing addresses that should contain valid kernel stack pointers. While the ideal resolution lies within the QEMU layer, a workaround has been implemented in the kernel to maintain compatibility with legacy setups. The issue has primarily manifested with vmware_hypercall3() and vmware_hypercall4(), highlighting the critical nature of robust memory access management in virtualization environments.

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