CVE-2026-89683nfsd: fix dentry ref leak on V4ROOT export filehandle lookup
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 – < d493cf57f4c4dae5396cd6ad41e5c209d0615a81
- affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 – < c1ae0f973bcba5730871e35976a0ab6878fdac34
- affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 – < 11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca
- affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 – < 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a
- affected 6.12
- unaffected < 6.12
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81 (opens in a new tab)
- https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34 (opens in a new tab)
- https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca (opens in a new tab)
- https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76595 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89683)Record last updated .