7.5
High
CVE-2021-47316 In the Linux kernel, the following vulnerability has been resolved: nfsd: fix NULL dereference in…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 5.14 | earliest → < 5.14 | 5.14 |
| Linux | 5.13 | 5.13.4 |
| RUGGEDCOM RST2428P | Versions not published | |
| SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family | Versions not published | |
| SCALANCE XCM-/XRM-/XCH-/XRH-300 family | Versions not published | |
| SIMATIC S7-1500 TM MFP - GNU/Linux subsystem 1.1 | earliest → < 1.1.1 | 1.1.1 |
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