There are several direct leak fixes in upstream 2.7 that could potentially be exploited that are worth backporting:
qdist: fix memory leak during binning
numa: do not leak NumaOptions
char: free the tcp connection data when closing
char: free MuxDriver when closing
ahci: free irqs array
qjson: free str
virtio-input: free config list
usb: free USBDevice.strings
usb: free leaking path
ahci: fix sglist leak on retry
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.