CVE-2020-35503 Null dereference in QEMU

What is CVE-2020-35503?

CVE-2020-35503 is a medium-severity vulnerability in Fedoraproject Fedora, published on 2 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Weakness: CWE-476

Which versions are affected by CVE-2020-35503?

It affects 2 products.

Products include Fedoraproject Fedora, Qemu Qemu.

How do I fix CVE-2020-35503?

Upgrade to a fixed version.

Is CVE-2020-35503 being exploited?

There is no known exploitation of CVE-2020-35503 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2020-35503, ECHO-c252-ae80-9db0, GHSA-x852-p4x4-vcgf, UBUNTU-CVE-2020-35503.