On Thu, Nov 30, 2017 at 10:37:40AM -0800, Guenter Roeck wrote:

Hi,

The fix for CVE-2017-16939 has been applied to v4.9.y, but not to v4.4.y
and older kernels. However, I confirmed that running the published POC
(see https://blogs.securiteam.com/index.php/archives/3535) does crash a 4.4
kernel.

I confirmed that the following two patches fix the problem in v4.4.y.
Please consider applying them to v4.4.y (and possibly v3.18.y).

fc9e50f5a5a4e ("netlink: add a start callback for starting a netlink dump")
1137b5e2529a8 ("ipsec: Fix aborted xfrm policy dump crash")

My apologies for the noise if this is already under consideration.

Ah, thanks for this, I had tried this a few times, and asked around, but
missed that just adding the first patch here would solve the issue.
Both are now queued up, thanks for bringing this up again.

greg k-h