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Date: Thu, 10 Dec 2015 01:19:34 -0500 (EST)
From: cve-assign@...re.org
To: wmealing@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE request - Linux kernel - Fix handling of stored error in a negatively instantiated user key

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Hash: SHA256

> A malicious user with a local account may be able to escalate privileges
> and take control of local system by abusing the user key subsystem.
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=096fe9eaea40a17e125569f9e657e34cdb6d73bd
> https://bugzilla.redhat.com/show_bug.cgi?id=1284450

> The following may be used to trigger the bug in the user key type:
> 
>   keyctl request2 user user "" @u
>   keyctl add user user "a" @u
> 
> BUG: unable to handle kernel paging request at 00000000ffffff8a
> 
> A similar bug can be tripped by:
> 
>   keyctl request2 trusted user "" @u
>   keyctl add trusted user "a" @u
> 
> This should also affect encrypted keys

Use CVE-2015-8539 for all of the mentioned variants of the problem
with all key types.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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