gss_mech_free in net/sunrpc/auth_gss/gss_mech_switch.c in the rpcsec_gss_krb5 implementation in the Linux...

Vulnerability Description

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

References

• https://bugzilla.kernel.org/show_bug.cgi?id=206651
• http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html
• https://usn.ubuntu.com/4483-1/
• https://usn.ubuntu.com/4485-1/