nfsd: fix dentry ref leak on V4ROOT export filehandle lookup
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.
CVE-2026-89683
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89683
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444",
"lessThan": "d493cf57f4c4dae5396cd6ad41e5c209d0615a81",
"versionType": "git"
},
{
"status": "affected",
"version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444",
"lessThan": "c1ae0f973bcba5730871e35976a0ab6878fdac34",
"versionType": "git"
},
{
"status": "affected",
"version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444",
"lessThan": "11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca",
"versionType": "git"
},
{
"status": "affected",
"version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444",
"lessThan": "6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a",
"versionType": "git"
}
],
"programFiles": [
"fs/nfsd/nfsfh.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nfsd/nfsfh.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89683
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #35170 · Revision 1
- Added to Heist Feed
- Publisher date