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CVE-2021-47368

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: enetc: Fix illegal access when reading affinity_hint irq_set_affinity_hit() stores a reference to the cpumask_t parameter in th…

Published May 21, 2024CWE-400EPSS 0.64%

Overview

CVE-2021-47368 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, 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:

enetc: Fix illegal access when reading affinity_hint

irq_set_affinity_hit() stores a reference to the cpumask_t

parameter in the irq descriptor, and that reference can be

accessed later from irq_affinity_hint_proc_show(). Since

the cpu_mask parameter passed to irq_set_affinity_hit() has

only temporary storage (it's on the stack memory), later

accesses to it are illegal. Thus reads from the corresponding

procfs affinity_hint file can result in paging request oops.

The issue is fixed by the get_cpu_mask() helper, which provides

a permanent storage for the cpumask_t parameter.

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/4c4c3052911b577920353a7646e4883d5da40c28Refgit.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7bRefgit.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270Refgit.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90Refgit.kernel.org/stable/c/4c4c3052911b577920353a7646e4883d5da40c28Refgit.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7bRefgit.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270Refgit.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47368?

CVE-2021-47368 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2021-47368?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2021-47368?

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-2021-47368?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47368 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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