CVE-2021-3847 Privilege escalation in kernel

What is CVE-2021-3847?

CVE-2021-3847 is a high-severity vulnerability in Fedoraproject Fedora, published on 1 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An unauthorized access to the execution of the setuid file with capabilities flaw in the Linux kernel OverlayFS subsystem was found in the way user copying a capable file from a nosuid mount into another mount. A local user could use this flaw to escalate their privileges on the system.

Weakness: CWE-281

Which versions are affected by CVE-2021-3847?

It affects 2 products.

Products include Fedoraproject Fedora, Linux kernel.

How do I fix CVE-2021-3847?

Apply the vendor's patch.

Is CVE-2021-3847 being exploited?

There is no known exploitation of CVE-2021-3847 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

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

Also known as AZL-9301, DEBIAN-CVE-2021-3847, GHSA-m6pr-c5vr-9466, ROOT-OS-DEBIAN-11-CVE-2021-3847, ROOT-OS-DEBIAN-12-CVE-2021-3847, ROOT-OS-DEBIAN-13-CVE-2021-3847 and 2 more.