CVE-2021-3543 Null dereference in kernel

What is CVE-2021-3543?

CVE-2021-3543 is a medium-severity vulnerability in Fedoraproject Fedora, published on 1 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.

Weakness: CWE-476, CWE-416

Which versions are affected by CVE-2021-3543?

It affects 3 products.

Products include Fedoraproject Fedora, Nitro Enclaves Project Nitro Enclaves, Redhat Enterprise Linux.

How do I fix CVE-2021-3543?

Apply the vendor's patch.

Is CVE-2021-3543 being exploited?

There is no known exploitation of CVE-2021-3543 in the wild and no public exploit code.

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• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
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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-2021-3543, GHSA-5rp3-9frh-m3wx, UBUNTU-CVE-2021-3543.