A flaw was found in QEMU in the uefi-vars virtual device. When the guest writes to register UEFI_VARS_REG_BUFFER_SIZE, the .write callback "uefi_vars_write" is invoked. The function allocates a heap buffer without zeroing the memory, leaving the buffer filled with residual data from prior allocations. When the guest later reads from register UEFI_VARS_REG_PIO_BUFFER_TRANSFER, the .read callback "uefi_vars_read" returns leftover metadata or other sensitive process memory from the previously allocated buffer, leading to an information disclosure vulnerability.