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.
Fix
Patch, vendor advisory and mitigation references on NVD 6
- https://git.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870 Patch
- https://git.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8 Patch
- https://git.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8d Patch
- https://git.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870 Patch
- https://git.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8 Patch
- https://git.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8d Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.5 · linuxNVD modified 2026-10-14 13:17
Affected (CPE criteria) 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References 8
- https://git.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870 Patch
- https://git.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8 Patch
- https://git.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8d Patch
- https://git.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870 Patch
- https://git.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8 Patch
- https://git.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8d Patch
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html