CVE-2021-3428 Integer overflow in kernel

What is CVE-2021-3428?

CVE-2021-3428 is a medium-severity vulnerability in Linux kernel, published on 4 Mar 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 denial of service problem is identified if an extent tree is corrupted in a crafted ext4 filesystem in fs/ext4/extents.c in ext4_es_cache_extent. Fabricating an integer overflow, A local attacker with a special user privilege may cause a system crash problem which can lead to an availability threat.

Weakness: CWE-190

Which versions are affected by CVE-2021-3428?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-3428?

Apply the vendor's patch.

Is CVE-2021-3428 being exploited?

There is no known exploitation of CVE-2021-3428 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2021-3428, GHSA-g9vc-85jh-rm36, UBUNTU-CVE-2021-3428.