Linux CVE-2026-31390

The xe driver is Intel's new GPU driver for Linux, handling direct rendering and memory management for discrete Intel GPUs. The xe_vm_madvise_ioctl function processes memory advice (madvise) operations on GPU virtual address spaces. When the check_bo_args_are_sane() validation function returns an error, the code previously jumped directly to the error return without invoking cleanup routines, leaving allocated VMA objects (data structures representing ranges in virtual memory) unreleased in kernel heap memory. This is a classic resource leak vulnerability in the error handling path of an ioctl (input/output control) system call handler. The fix adds a proper cleanup label that deallocates all VMA structures before returning the error code.