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CVE-2021-47289

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ACPI: fix NULL pointer dereference Commit 71f642833284 ("ACPI: utils: Fix reference counting in for_each_acpi_dev_match()") sta…

Published May 21, 2024CWE-476EPSS 0.24%

Overview

CVE-2021-47289 is a medium-severity vulnerability. It was published on May 21, 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:

ACPI: fix NULL pointer dereference

Commit 71f642833284 ("ACPI: utils: Fix reference counting in

for_each_acpi_dev_match()") started doing "acpi_dev_put()" on a pointer

that was possibly NULL. That fails miserably, because that helper

inline function is not set up to handle that case.

Just make acpi_dev_put() silently accept a NULL pointer, rather than

calling down to put_device() with an invalid offset off that NULL

pointer.

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/38f54217b423c0101d03a00feec6fb8ec608b12eRefgit.kernel.org/stable/c/cae3fa3d8165761f3000f523b11cfa1cd35206bcRefgit.kernel.org/stable/c/ccf23a0888077a25a0793a746c3941db2a7562e4Refgit.kernel.org/stable/c/fc68f42aa737dc15e7665a4101d4168aadb8e4c4Refgit.kernel.org/stable/c/38f54217b423c0101d03a00feec6fb8ec608b12eRefgit.kernel.org/stable/c/cae3fa3d8165761f3000f523b11cfa1cd35206bcRefgit.kernel.org/stable/c/ccf23a0888077a25a0793a746c3941db2a7562e4Refgit.kernel.org/stable/c/fc68f42aa737dc15e7665a4101d4168aadb8e4c4

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47289?

CVE-2021-47289 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47289?

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-2021-47289?

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-2021-47289?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47289 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.

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