CVE-2026-89683

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89683", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.748Z", "datePublished": "2026-09-11T19:46:05.635Z", "dateUpdated": "2026-10-19T08:50:56.607Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:50:56.607Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix dentry ref leak on V4ROOT export filehandle lookup\n\nnfsd_set_fh_dentry() leaks the dentry reference from\nexportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE\nswitch cases detect NFSEXP_V4ROOT and goto out. The out: label\ncalls exp_put() but never dput(dentry), and fhp->fh_dentry was\nnever assigned so fh_put() cannot compensate.\n\nA crafted NFSv3 filehandle targeting a V4ROOT export's fsid\ntriggers the leak on every request."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfsfh.c"], "versions": [{"version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444", "lessThan": "d493cf57f4c4dae5396cd6ad41e5c209d0615a81", "status": "affected", "versionType": "git"}, {"version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444", "lessThan": "c1ae0f973bcba5730871e35976a0ab6878fdac34", "status": "affected", "versionType": "git"}, {"version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444", "lessThan": "11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca", "status": "affected", "versionType": "git"}, {"version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444", "lessThan": "6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfsfh.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81"}, {"url": "https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34"}, {"url": "https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca"}, {"url": "https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a"}], "title": "nfsd: fix dentry ref leak on V4ROOT export filehandle lookup", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfsd/nfsfh.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d493cf57f4c4dae5396cd6ad41e5c209d0615a81", "status": "affected", "version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444", "versionType": "git"}, {"lessThan": "c1ae0f973bcba5730871e35976a0ab6878fdac34", "status": "affected", "version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444", "versionType": "git"}, {"lessThan": "11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca", "status": "affected", "version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444", "versionType": "git"}, {"lessThan": "6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a", "status": "affected", "version": "ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfsd/nfsfh.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix dentry ref leak on V4ROOT export filehandle lookup\n\nnfsd_set_fh_dentry() leaks the dentry reference from\nexportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE\nswitch cases detect NFSEXP_V4ROOT and goto out. The out: label\ncalls exp_put() but never dput(dentry), and fhp->fh_dentry was\nnever assigned so fh_put() cannot compensate.\n\nA crafted NFSv3 filehandle targeting a V4ROOT export's fsid\ntriggers the leak on every request."}], "id": "CVE-2026-89683", "lastModified": "2026-10-19T09:18:06.670", "metrics": {}, "published": "2026-09-11T20:19:55.173", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel's nfsd: Denial of Service via crafted NFSv3 filehandle", "id": "2532313", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532313"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's nfsd (NFS daemon). A remote attacker could exploit this vulnerability by sending a specially crafted NFSv3 filehandle targeting a V4ROOT export's file system identifier (fsid). This action triggers a dentry reference leak, which can lead to resource exhaustion and ultimately result in a Denial of Service (DoS) on the affected system."], "name": "CVE-2026-89683", "public_date": "2026-09-11T19:46:05Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89683\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89683\nhttps://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca\nhttps://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a\nhttps://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34\nhttps://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444,d493cf57f4c4dae5396cd6ad41e5c209d0615a81)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444,c1ae0f973bcba5730871e35976a0ab6878fdac34)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444,11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444,6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T04:45:07.679020+00:00", "updated": "2026-09-15T20:45:20.771085+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}