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CVE-2021-46966

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ACPI: custom_method: fix potential use-after-free issue In cm_write(), buf is always freed when reaching the end of the function.

Published Feb 27, 2024CWE-416EPSS 0.23%

Overview

CVE-2021-46966 is a high-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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: custom_method: fix potential use-after-free issue

In cm_write(), buf is always freed when reaching the end of the

function. If the requested count is less than table.length, the

allocated buffer will be freed but subsequent calls to cm_write() will

still try to access it.

Remove the unconditional kfree(buf) at the end of the function and

set the buf to NULL in the -EINVAL error path to match the rest of

function.

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/1d53ca5d131074c925ce38361fb0376d3bf7e394Refgit.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203Refgit.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4bRefgit.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9beRefgit.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23Refgit.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17Refgit.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234Refgit.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aaRefgit.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4bRefgit.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46966?

CVE-2021-46966 is a high-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-46966?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-46966?

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-2021-46966?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46966 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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