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CVE-2021-47316

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix NULL dereference in nfs3svc_encode_getaclres In error cases the dentry may be NULL.

Published May 21, 2024CWE-476EPSS 0.62%

Overview

CVE-2021-47316 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

nfsd: fix NULL dereference in nfs3svc_encode_getaclres

In error cases the dentry may be NULL.

Before 20798dfe249a, the encoder also checked dentry and

d_really_is_positive(dentry), but that looks like overkill to me--zero

status should be enough to guarantee a positive dentry.

This isn't the first time we've seen an error-case NULL dereference

hidden in the initialization of a local variable in an xdr encoder. But

I went back through the other recent rewrites and didn't spot any

similar bugs.

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/650e6f383a6eb40f7c0a010982a74ab4b6893870Refgit.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8Refgit.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8dRefgit.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870Refgit.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8Refgit.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8dRefcert-portal.siemens.com/productcert/html/ssa-265688.htmlRefcert-portal.siemens.com/productcert/html/ssa-355557.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47316?

CVE-2021-47316 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-47316?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47316?

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-2021-47316?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47316 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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