nfsd: fix dentry ref leak on V4ROOT export filehandle lookup

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In the Linux kernel, the following vulnerability has been resolved: nfsd: fix dentry ref leak on V4ROOT export filehandle lookup nfsd_set_fh_dentry() leaks the dentry reference from exportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE switch cases detect NFSEXP_V4ROOT and goto out. The out: label calls exp_put() but never dput(dentry), and fhp->fh_dentry was never assigned so fh_put() cannot compensate. A crafted NFSv3 filehandle targeting a V4ROOT export's fsid triggers the leak on every request.

Source published

11 Sep 2026 19:46:05 UTC

Source modified

19 Oct 2026 08:50:56 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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