CVE-2021-3760 Use after free in kernel

What is CVE-2021-3760?

CVE-2021-3760 is a high-severity use after free vulnerability in Debian Debian Linux, published on 16 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in the Linux kernel. A use-after-free vulnerability in the NFC stack can lead to a threat to confidentiality, integrity, and system availability.

Weakness: CWE-416

Which versions are affected by CVE-2021-3760?

It affects 11 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Linux kernel, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware and 5 more.

How do I fix CVE-2021-3760?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2021-3760 being exploited?

There is no known exploitation of CVE-2021-3760 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2021-3760, GHSA-4jqv-ghx3-vc2h, UBUNTU-CVE-2021-3760.