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CVE-2021-46928

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: parisc: Clear stale IIR value on instruction access rights trap When a trap 7 (Instruction access rights) occurs, this means th…

Published Feb 27, 2024CWE-755EPSS 0.22%

Overview

CVE-2021-46928 is a medium-severity vulnerability. It was published on February 27, 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:

parisc: Clear stale IIR value on instruction access rights trap

When a trap 7 (Instruction access rights) occurs, this means the CPU

couldn't execute an instruction due to missing execute permissions on

the memory region. In this case it seems the CPU didn't even fetched

the instruction from memory and thus did not store it in the cr19 (IIR)

register before calling the trap handler. So, the trap handler will find

some random old stale value in cr19.

This patch simply overwrites the stale IIR value with a constant magic

"bad food" value (0xbaadf00d), in the hope people don't start to try to

understand the various random IIR values in trap 7 dumps.

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/484730e5862f6b872dca13840bed40fd7c60fa26Refgit.kernel.org/stable/c/d01e9ce1af6116f812491d3d3873d204f10ae0b8Refgit.kernel.org/stable/c/e96373f0a5f484bc1e193f9951dcb3adf24bf3f7Refgit.kernel.org/stable/c/484730e5862f6b872dca13840bed40fd7c60fa26Refgit.kernel.org/stable/c/d01e9ce1af6116f812491d3d3873d204f10ae0b8Refgit.kernel.org/stable/c/e96373f0a5f484bc1e193f9951dcb3adf24bf3f7

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46928?

CVE-2021-46928 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-46928?

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-2021-46928?

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-2021-46928?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46928 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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