Go to homepageCyberStrike

Menu

Star on GitHub · 3.4k
Sign inDownload

CVE-2021-47509

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Limit the period size to 16MB Set the practical limit to the period size (the fragment shift in OSS) instead of…

Published May 24, 2024EPSS 0.24%

Overview

CVE-2021-47509 is a medium-severity vulnerability. It was published on May 24, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ALSA: pcm: oss: Limit the period size to 16MB

Set the practical limit to the period size (the fragment shift in OSS)

instead of a full 31bit; a too large value could lead to the exhaust

of memory as we allocate temporary buffers of the period size, too.

As of this patch, we set to 16MB limit, which should cover all use

cases.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28aRefgit.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2Refgit.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3Refgit.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2Refgit.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43cRefgit.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257Refgit.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aebRefgit.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bccRefgit.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28aRefgit.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47509?

CVE-2021-47509 is a medium-severity vulnerability. It was published on May 24, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47509?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47509?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47509?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47509 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related MEDIUM CVEs from 2021

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
LiveWatch live →