CVE-2021-47316

MediumCVSS 5.5/10Last modified Oct 14, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

VendorProductVersions
LinuxLinux>= d505e66191072748620fc0af038cea4e4da0e3cd, < e79057d15d96ef19de4de6d7e479bae3d58a2a8d; >= 20798dfe249a01ad1b12eec7dbc572db5003244a, < 650e6f383a6eb40f7c0a010982a74ab4b6893870; >= 20798dfe249a01ad1b12eec7dbc572db5003244a, < ab1016d39cc052064e32f25ad18ef8767a0ee3b8
LinuxLinux5.13
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystem< V1.1.1

References

Timeline

Published
May 21, 2024
Last modified
Oct 14, 2026
NVD status
Modified

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CVE-2021-47316: Medium severity, CVSS 5.5 | Vulnix