CVE-2021-4148 Denial of service in kernel

What is CVE-2021-4148?

CVE-2021-4148 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 23 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability was found in the Linux kernel's block_invalidatepage in fs/buffer.c in the filesystem. A missing sanity check may allow a local attacker with user privilege to cause a denial of service (DOS) problem.

Weakness: CWE-354

Which versions are affected by CVE-2021-4148?

It affects 2 products.

Products include Fedoraproject Fedora, Linux kernel.

How do I fix CVE-2021-4148?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-4148 being exploited?

There is no known exploitation of CVE-2021-4148 in the wild and no public exploit code.

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• 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 DEBIAN-CVE-2021-4148, GHSA-42rf-8fff-r463, UBUNTU-CVE-2021-4148.