What is CVE-2021-3543?

CVE-2021-3543 is a medium-severity vulnerability in Nitro Enclaves Project, classified under Use After Free. CVSS score: 6.7/10. Published 2021-06-01.

How severe is CVE-2021-3543?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Use After Free in Nitro Enclaves Project

CVE-2021-3543

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.

Vulnerability class: Use-After-Free

EPSS: 0.003 (22.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Nitro_enclaves_project Nitro_enclaves
Fedoraproject Fedora — versions 34
Redhat Enterprise_linux — versions 8.0
N/a Kernel — versions kernel 4.18.0

Weakness classification (CWE)

References

secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
secalert@redhat.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-3543?: CVE-2021-3543 is a medium-severity vulnerability in Nitro Enclaves Project, classified under Use After Free. CVSS score: 6.7/10. Published 2021-06-01.
How severe is CVE-2021-3543?: Medium severity. CVSS v3 base score is 6.7 out of 10.