CVE-2026-89683
Unknown
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.
SeverityUnknown
CVSS—
Exploit probability—
Product
Linux
PublishedSep 11, 2026
First seenSep 11, 2026
How to fix
Update
- Linux Linuxd493cf57f4c4dae5396cd6ad41e5c209d0615a81, c1ae0f973bcba5730871e35976a0ab6878fdac34, 11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca, 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 ≤ v < d493cf57f4c4dae5396cd6ad41e5c209d0615a81, ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 ≤ v < c1ae0f973bcba5730871e35976a0ab6878fdac34, ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 ≤ v < 11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca, ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 ≤ v < 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a, 6.12 | d493cf57f4c4dae5396cd6ad41e5c209d0615a81, c1ae0f973bcba5730871e35976a0ab6878fdac34, 11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca, 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a |
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