CVE-2021-33631 Kernel crash in EXT4 filesystem

Medium 5.5 Published 18 Jan 2024 Updated 13 Feb 2025

An integer overflow in the EXT4 filesystem module allows attackers to cause a kernel crash, resulting in denial of service.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2021-33631?

CVE-2021-33631 is a medium-severity vulnerability in openEuler kernel, published on 18 Jan 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Integer Overflow or Wraparound vulnerability in openEuler kernel on Linux (filesystem modules) allows Forced Integer Overflow.This issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3, from 5.10.0-60.18.0 before 5.10.0-183.0.0.

Weakness: CWE-190

Which versions are affected by CVE-2021-33631?

It affects 1 product.

Products include Openatom Openeuler.

How do I fix CVE-2021-33631?

Apply the vendor's patch.

Is CVE-2021-33631 being exploited?

There is no known exploitation of CVE-2021-33631 in the wild and no public exploit code.

CVE-2021-33630 NULL-ptr-deref in network sched Medium 5.5

Sources

Also known as DEBIAN-CVE-2021-33631, GHSA-ff22-5jp8-224r, UBUNTU-CVE-2021-33631.