Vulnerability Details CVE-2021-47316
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 27.6%
CVSS Severity
CVSS v3 Score 5.5
References
- https://git.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870
- https://git.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8
- https://git.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8d
- https://git.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870
- https://git.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8
- https://git.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8d
Products affected by CVE-2021-47316
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cpe:2.3:o:linux:linux_kernel:5.13
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cpe:2.3:o:linux:linux_kernel:5.13.0-52
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cpe:2.3:o:linux:linux_kernel:5.13.1
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cpe:2.3:o:linux:linux_kernel:5.13.2
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cpe:2.3:o:linux:linux_kernel:5.13.3