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CVE-2021-47276

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be us…

Published May 21, 2024CWE-706EPSS 0.24%

Overview

CVE-2021-47276 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:

ftrace: Do not blindly read the ip address in ftrace_bug()

It was reported that a bug on arm64 caused a bad ip address to be used for

updating into a nop in ftrace_init(), but the error path (rightfully)

returned -EINVAL and not -EFAULT, as the bug caused more than one error to

occur. But because -EINVAL was returned, the ftrace_bug() tried to report

what was at the location of the ip address, and read it directly. This

caused the machine to panic, as the ip was not pointing to a valid memory

address.

Instead, read the ip address with copy_from_kernel_nofault() to safely

access the memory, and if it faults, report that the address faulted,

otherwise report what was in that location.

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/0bc62e398bbd9e600959e610def5109957437b28Refgit.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875Refgit.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09bRefgit.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051Refgit.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2Refgit.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fbRefgit.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81Refgit.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7Refgit.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28Refgit.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47276?

CVE-2021-47276 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-2021-47276?

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-2021-47276?

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-2021-47276?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47276 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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