oss-security - CVE-2017-1000252: KVM denial of service with posted interrupts on Intel systems (since Linux 4.4)

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <63ba101d-71b7-fcb0-5f28-ed6f78ebfbbd@amazon.de>
Date: Fri, 15 Sep 2017 18:36:59 +0200
From: "Jan H. Schönherr" <jschoenh@...zon.de>
To: oss-security@...ts.openwall.com
Subject: CVE-2017-1000252: KVM denial of service with posted interrupts on
 Intel systems (since Linux 4.4)

Hi.

We have discovered a user triggerable BUG() when using KVM with posted interrupts on Intel
systems. This requires an unprivileged user to have access to the KVM device.

Certain values in a KVM_IRQFD API call can trigger a BUG_ON() at a later point in
vmx_update_pi_irte(). KVM as a whole seems to hang after that.

The issue was introduced with Linux 4.4, patches have been posted to the KVM
mailing list:
- https://marc.info/?l=kvm&m=150549145711115&w=2
- https://marc.info/?l=kvm&m=150549146311117&w=2

Regards
Jan H. Schönherr

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.