Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2021-47312

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: Fix dereference of null pointer flow In the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then…

Published May 21, 2024CWE-476EPSS 0.22%

Overview

CVE-2021-47312 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:

netfilter: nf_tables: Fix dereference of null pointer flow

In the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then

nft_flow_rule_create is not called and flow is NULL. The subsequent

error handling execution via label err_destroy_flow_rule will lead

to a null pointer dereference on flow when calling nft_flow_rule_destroy.

Since the error path to err_destroy_flow_rule has to cater for null

and non-null flows, only call nft_flow_rule_destroy if flow is non-null

to fix this issue.

Addresses-Coverity: ("Explicity null dereference")

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/4ca041f919f13783b0b03894783deee00dbca19aRefgit.kernel.org/stable/c/70a5a1950cca02c5cd161bb3846b4d983eed97d3Refgit.kernel.org/stable/c/4ca041f919f13783b0b03894783deee00dbca19aRefgit.kernel.org/stable/c/70a5a1950cca02c5cd161bb3846b4d983eed97d3

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47312?

CVE-2021-47312 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-2021-47312?

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-2021-47312?

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-2021-47312?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47312 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.

Related MEDIUM CVEs from 2021

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999