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Vulnerability of QEMU: NULL pointer dereference via pci_change_irq_level

Synthesis of the vulnerability 

An attacker, inside a guest system, can force a NULL pointer to be dereferenced via pci_change_irq_level() of QEMU, in order to trigger a denial of service on the host system.
Impacted software: QEMU.
Severity of this computer vulnerability: 1/4.
Creation date: 29/09/2020.
Références of this announce: CVE-2020-25742, VIGILANCE-VUL-33448.

Description of the vulnerability 

An attacker, inside a guest system, can force a NULL pointer to be dereferenced via pci_change_irq_level() of QEMU, in order to trigger a denial of service on the host system.
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This computer vulnerability impacts software or systems such as QEMU.

Our Vigil@nce team determined that the severity of this weakness bulletin 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 weakness.

Solutions for this threat 

QEMU: patch for pci_change_irq_level.
A patch is indicated in information sources.
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