{"id":"CVE-2026-89683","revision":"458524dac56848afbd4fbdd783971318","records":[{"revision":"458524dac56848afbd4fbdd783971318","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89683","aliases":[],"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":0,"publishedAt":"2026-09-11T19:46:05.635+00:00","modifiedAt":"2026-10-19T08:50:56.607+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/nfsd/nfsfh.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444\",\n                            \"lessThan\": \"d493cf57f4c4dae5396cd6ad41e5c209d0615a81\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444\",\n                            \"lessThan\": \"c1ae0f973bcba5730871e35976a0ab6878fdac34\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444\",\n                            \"lessThan\": \"11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444\",\n                            \"lessThan\": \"6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/nfsd/nfsfh.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.12\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89683","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89683","identifiers":["CVE-2026-89683"]},"retained":false,"historicalAffected":[]}],"coverage":[]}