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Vulnerability of OpenBSD: denial of service via kevent

Synthesis of the vulnerability 

A local attacker can block kevents on OpenBSD, in order to trigger a denial of service.
Vulnerable products: OpenBSD.
Severity of this weakness: 1/4.
Creation date: 15/10/2015.
Références of this bulletin: VIGILANCE-VUL-18114.

Description of the vulnerability 

The OpenBSD kernel uses kevent to manage events.

However, a local attacker can generate a fatal error in kevent.

A local attacker can therefore block kevents on OpenBSD, in order to trigger a denial of service.
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This security threat impacts software or systems such as OpenBSD.

Our Vigil@nce team determined that the severity of this computer weakness note is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this computer threat alert.

Solutions for this threat 

OpenBSD: patch for kevent.
A patch is available:
  http://ftp.openbsd.org/pub/OpenBSD/patches/5.6/common/032_kevent.patch.sig
  http://ftp.openbsd.org/pub/OpenBSD/patches/5.7/common/018_kevent.patch.sig
  http://ftp.openbsd.org/pub/OpenBSD/patches/5.8/common/005_kevent.patch.sig
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Vigil@nce provides system vulnerability alerts. The Vigil@nce team tracks computer vulnerabilities impacting systems and applications.