CVE-2026-89683nfsd: fix dentry ref leak on V4ROOT export filehandle lookup
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 11, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 before d493cf57f4c4dae5396cd6ad41e5c209d0615a81; from ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 before c1ae0f973bcba5730871e35976a0ab6878fdac34; from ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 before 11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca; from ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 before 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a | CNA record |
References
- https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81
- https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34
- https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca
- https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.