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CVE-2021-46991

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: i40e: Fix use-after-free in i40e_client_subtask() Currently the call to i40e_client_del_instance frees the object pf->cinst, ho…

Published Feb 28, 2024CWE-416EPSS 0.24%

Overview

CVE-2021-46991 is a high-severity vulnerability. It was published on February 28, 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:

i40e: Fix use-after-free in i40e_client_subtask()

Currently the call to i40e_client_del_instance frees the object

pf->cinst, however pf->cinst->lan_info is being accessed after

the free. Fix this by adding the missing return.

Addresses-Coverity: ("Read from pointer after free")

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/1fd5d262e7442192ac7611ff1597a36c5b044323Refgit.kernel.org/stable/c/38318f23a7ef86a8b1862e5e8078c4de121960c3Refgit.kernel.org/stable/c/4ebc10aa7cd17fd9857dedac69600465c9dd16d1Refgit.kernel.org/stable/c/829a713450b8fb127cbabfc1244c1d8179ec5107Refgit.kernel.org/stable/c/c1322eaeb8af0d8985b5cc5fa759140fa0e57b84Refgit.kernel.org/stable/c/d718c15a2bf9ae082d5ae4d177fb19ef23cb4132Refgit.kernel.org/stable/c/1fd5d262e7442192ac7611ff1597a36c5b044323Refgit.kernel.org/stable/c/38318f23a7ef86a8b1862e5e8078c4de121960c3Refgit.kernel.org/stable/c/4ebc10aa7cd17fd9857dedac69600465c9dd16d1Refgit.kernel.org/stable/c/829a713450b8fb127cbabfc1244c1d8179ec5107

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46991?

CVE-2021-46991 is a high-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-46991?

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-2021-46991?

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-2021-46991?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46991 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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