CVE-2021-3739 Null dereference in kernel

What is CVE-2021-3739?

CVE-2021-3739 is a high-severity vulnerability in Fedoraproject Fedora, published on 7 Mar 2022. 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 btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel internal information. The highest threat from this vulnerability is to system availability.

Weakness: CWE-476

Which versions are affected by CVE-2021-3739?

It affects 10 products.

Products include Fedoraproject Fedora, Linux kernel, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware and 4 more.

How do I fix CVE-2021-3739?

Apply the vendor's patch.

Is CVE-2021-3739 being exploited?

There is no known exploitation of CVE-2021-3739 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2021-3739, UBUNTU-CVE-2021-3739.