CVE-2021-47316

nfsd: fix NULL dereference in nfs3svc_encode_getaclres

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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8d patch
https://git.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870 patch
https://git.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8 patch

Frequently Asked Questions

What is the severity of CVE-2021-47316?
CVE-2021-47316 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47316?
To fix CVE-2021-47316, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47316 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47316 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47316?
CVE-2021-47316 affects Linux Linux, Linux Linux.
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