** DISPUTED ** gss_mech_free in net/sunrpc/auth_gss/gss_mech_switch.c in
the rpcsec_gss_krb5 implementation in the Linux kernel through 5.6.10 lacks
certain domain_release calls, leading to a memory leak. Note: This was
disputed with the assertion that the issue does not grant any access not
already available. It is a problem that on unloading a specific kernel
module some memory is leaked, but loading kernel modules is a privileged
operation. A user could also write a kernel module to consume any amount of
memory they like and load that replicating the effect of this bug.

It was discovered that the Kerberos SUNRPC GSS implementation in the Linux
kernel did not properly deallocate memory on module unload. A local
privileged attacker could possibly use this to cause a denial of service
(memory exhaustion).

sbeattie

upstream generally treats module unload as an unsafe operation, which may explain a lack of progress in addressing the issue.