Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2021-47523

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr This buffer is currently allocated in hfi1_init(): if (reinit) ret = init_afte…

Published May 24, 2024CWE-401EPSS 0.24%

Overview

CVE-2021-47523 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:

IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr

This buffer is currently allocated in hfi1_init():

if (reinit)

ret = init_after_reset(dd);

else

ret = loadtime_init(dd);

if (ret)

goto done;

/* allocate dummy tail memory for all receive contexts */

dd->rcvhdrtail_dummy_kvaddr = dma_alloc_coherent(&dd->pcidev->dev,

sizeof(u64),

&dd->rcvhdrtail_dummy_dma,

GFP_KERNEL);

if (!dd->rcvhdrtail_dummy_kvaddr) {

dd_dev_err(dd, "cannot allocate dummy tail memory\n");

ret = -ENOMEM;

goto done;

}

The reinit triggered path will overwrite the old allocation and leak it.

Fix by moving the allocation to hfi1_alloc_devdata() and the deallocation

to hfi1_free_devdata().

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/2c08271f4ed0e24633b3f81ceff61052b9d45efcRefgit.kernel.org/stable/c/60a8b5a1611b4a26de4839ab9c1fc2a9cf3e17c1Refgit.kernel.org/stable/c/834d0fb978643eaf09da425de197cc16a7c2761bRefgit.kernel.org/stable/c/2c08271f4ed0e24633b3f81ceff61052b9d45efcRefgit.kernel.org/stable/c/60a8b5a1611b4a26de4839ab9c1fc2a9cf3e17c1Refgit.kernel.org/stable/c/834d0fb978643eaf09da425de197cc16a7c2761b

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47523?

CVE-2021-47523 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-2021-47523?

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-2021-47523?

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-2021-47523?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47523 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