Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri, 20 Jan 2017 09:26:35 +0100
From: Greg KH <>
Cc: Jesse Hertz <>,
	Wade Mealing <>
Subject: Re: CVE REQUEST: linux kernel: process with pgid zero
 able to crash kernel

On Fri, Jan 20, 2017 at 01:41:52PM +1100, Harshula wrote:
> Hi Folks,
> Red Hat Product Security has been notified of a kernel vulnerability
> that a local attacker can exploit to crash/panic the kernel and cause a
> denial of service.
> This was reported to Red Hat by Jesse Hertz (CC'd) (reproducer:
> rt411016):
> "A process that is in the same process group as the ``init'' process
> (group id zero) can crash the Linux 2 kernel with several system calls
> by passing in a process ID or process group ID of zero. The value zero
> is a special value that indicates the current process ID or process
> group. However, in this case it is also the process group ID of the
> process."
> I've been testing whether RHEL is vulnerable and found the following:
> * Upstream/mainline is not vulnerable

Is this true for the mainline kernel tree that RHEL 6 was based on?

> * RHEL 7 is not vulnerable
> * RHEL 6 is vulnerable
> * RHEL 5 is partially vulnerable

So this is only due to a specific set of patches that were added to RHEL
6 and RHEL 5 yet never made it upstream?  I ask as we want to make sure
some of the older LTS mainline kernels might be affected and it would be
good to ensure they are not.


greg k-h

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.