Riskcovery

CVE-2026-89683

nfsd: fix dentry ref leak on V4ROOT export filehandle lookup

State
Published
Severity
Not scored
Published
Sep 11, 2026
Updated
Oct 19, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 to before d493cf57f4c4dae5396cd6ad41e5c209d0615a81Affected
  • ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 to before c1ae0f973bcba5730871e35976a0ab6878fdac34Affected
  • ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 to before 11db8df188b34bdb8c6a3a0bf438e5fc8cd75acaAffected
  • ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 to before 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15aAffected
LinuxLinux
  • 6.12Affected
  • before 6.12Not affected
  • 6.12.109 through 6.12.*Not affected
  • 6.18.50 through 6.18.*Not affected
  • 7.2.4 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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