nfsd: fix dentry ref leak on V4ROOT export filehandle lookup (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.18 % · percentile 7 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
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.
References
European references
- ENISA EUVD · EUVD-2026-76595
- GCVE · GCVE-0-2026-89683
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1372 — Multiples vulnérabilités dans les produits SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 < d493cf57f4c4dae5396cd6ad41e5c209d0615a81 ; affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 < c1ae0f973bcba5730871e35976a0ab6878fdac34 ; affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 < 11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca ; affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 < 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a |
| Linux · Linux | affected 6.12 ; unaffected 0 < 6.12 ; unaffected 6.12.109 ≤ 6.12.* ; unaffected 6.18.50 ≤ 6.18.* ; unaffected 7.2.4 ≤ 7.2.* ; unaffected 7.3 ≤ * |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |