nfsd: fix dentry ref leak on V4ROOT export filehandle lookup

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89683
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:55 UTC
Updated2026-09-11 20:19:55 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001750000 probability, percentile 0.071930000 (date 2026-09-13)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 d493cf57f4c4dae5396cd6ad41e5c209d0615a81 git Not specified
CNA Linux Linux affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 c1ae0f973bcba5730871e35976a0ab6878fdac34 git Not specified
CNA Linux Linux affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca git Not specified
CNA Linux Linux affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report