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CVE-2021-47387

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: cpufreq: schedutil: Use kobject release() method to free sugov_tunables The struct sugov_tunables is protected by the kobject,…

Published May 21, 2024CWE-763EPSS 0.25%

Overview

CVE-2021-47387 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:

cpufreq: schedutil: Use kobject release() method to free sugov_tunables

The struct sugov_tunables is protected by the kobject, so we can't free

it directly. Otherwise we would get a call trace like this:

ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x30

WARNING: CPU: 3 PID: 720 at lib/debugobjects.c:505 debug_print_object+0xb8/0x100

Modules linked in:

CPU: 3 PID: 720 Comm: a.sh Tainted: G W 5.14.0-rc1-next-20210715-yocto-standard+ #507

Hardware name: Marvell OcteonTX CN96XX board (DT)

pstate: 40400009 (nZcv daif +PAN -UAO -TCO BTYPE=--)

pc : debug_print_object+0xb8/0x100

lr : debug_print_object+0xb8/0x100

sp : ffff80001ecaf910

x29: ffff80001ecaf910 x28: ffff00011b10b8d0 x27: ffff800011043d80

x26: ffff00011a8f0000 x25: ffff800013cb3ff0 x24: 0000000000000000

x23: ffff80001142aa68 x22: ffff800011043d80 x21: ffff00010de46f20

x20: fff

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/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446cRefgit.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9Refgit.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82Refgit.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9Refgit.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1Refgit.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849aRefgit.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364dRefgit.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446cRefgit.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9Refgit.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47387?

CVE-2021-47387 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-2021-47387?

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-2021-47387?

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-2021-47387?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47387 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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