Date: Fri, 15 Sep 2017 18:36:59 +0200 From: "Jan H. Sch=c3=b6nherr" <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
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