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Vulnerability of OpenBSD: denial of service via PROT_NONE MAP_SHARED

Synthesis of the vulnerability 

An attacker can trigger a fatal error via PROT_NONE MAP_SHARED of OpenBSD, in order to trigger a denial of service.
Vulnerable products: OpenBSD.
Severity of this weakness: 1/4.
Creation date: 06/10/2020.
Références of this bulletin: VIGILANCE-VUL-33486.

Description of the vulnerability 

An attacker can trigger a fatal error via PROT_NONE MAP_SHARED of OpenBSD, in order to trigger a denial of service.
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This computer weakness bulletin impacts software or systems such as OpenBSD.

Our Vigil@nce team determined that the severity of this computer threat announce 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 threat announce.

Solutions for this threat 

OpenBSD: patch for PROT_NONE MAP_SHARED.
A patch is available:
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.7/common/024_mmap.patch.sig
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