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Linux kernel through 5.6.10 Missing Release of Resource after Effective Lifetime Vulnerability

Summary

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. This was disputed with the assertion that the issue does not grant any access not already available. 

Credit:

The information has been provided by kircher

The original article can be found at:https://bugzilla.kernel.org/show_bug.cgi?id=206651

Details

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.

Vulnerable Systems:

Linux kernel through 5.6.10 

CVE Information:

CVE-2020-12656

Disclosure Timeline:
Published Date:5/5/2020

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