{"api_version":"1","generated_at":"2026-09-14T02:10:11+00:00","cve":"CVE-2026-89683","urls":{"html":"https://cve.report/CVE-2026-89683","api":"https://cve.report/api/cve/CVE-2026-89683.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89683","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89683"},"summary":{"title":"nfsd: fix dentry ref leak on V4ROOT export filehandle lookup","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:55","updated_at":"2026-09-11 20:19:55"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a","name":"https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34","name":"https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81","name":"https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca","name":"https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89683","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89683","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 d493cf57f4c4dae5396cd6ad41e5c209d0615a81 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 c1ae0f973bcba5730871e35976a0ab6878fdac34 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"89683","cve":"CVE-2026-89683","epss":"0.001750000","percentile":"0.071930000","score_date":"2026-09-13","updated_at":"2026-09-14 00:18:02"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"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-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:46:05.635Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89683","datePublished":"2026-09-11T19:46:05.635Z","dateReserved":"2026-09-11T19:38:34.748Z","dateUpdated":"2026-09-11T19:46:05.635Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:55","lastModifiedDate":"2026-09-11 20:19:55","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89683","Ordinal":"1","Title":"nfsd: fix dentry ref leak on V4ROOT export filehandle lookup","CVE":"CVE-2026-89683","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89683","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"nfsd: fix dentry ref leak on V4ROOT export filehandle lookup"}]}}}