{"id":"CVE-2026-89715","revision":"bd305befc0af44dea6bcfc96a0167244","records":[{"revision":"bd305befc0af44dea6bcfc96a0167244","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89715","aliases":[],"title":"NFS/localio: fix ref leak on nfs_uuid_add_file failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFS/localio: fix ref leak on nfs_uuid_add_file failure\n\nWhen nfs_uuid_add_file() races with nfs_uuid_put() tearing down\nuuid->net, it returns -ENXIO without publishing nfl->nfs_uuid via\nrcu_assign_pointer().  nfs_open_local_fh() then enters its error\nbranch and only releases the slot's file ref and its paired net\nref plus its own entry-time net ref, while the close path is a\nno-op:\n\n    nfs_close_local_fh()\n      nfs_uuid = rcu_dereference(nfl->nfs_uuid);\n      if (!nfs_uuid) { rcu_read_unlock(); return; }  /* always */\n\nnfsd_open_local_fh() returns localio holding a caller-owned +1\nnfsd_file reference (from nfsd_file_get() after\nnfsd_file_acquire_local()) and an entry-time nfsd_net reference\n(from its first nfsd_net_try_get()) embedded as nf->nf_net.  Both\nare leaked on the failure path, pinning one nfsd_file (and the\nunderlying struct file, dentry, inode) and one nfsd_net_ref per\noccurrence, which blocks nfsd_net and netns teardown.\n\nFix by releasing the caller-owned file ref and its net ref through\nthe existing helper, using a stack-local RCU pointer so the helper\ncan xchg it out, then returning -ENXIO so callers do not\ndereference a localio whose slot has been cleared:\n\n    struct nfsd_file __rcu *tmp = RCU_INITIALIZER(localio);\n\n    nfs_to_nfsd_file_put_local(pnf);\n    nfs_to_nfsd_file_put_local(&tmp);\n    localio = ERR_PTR(-ENXIO);\n\nThe trailing nfs_to_nfsd_net_put(net) continues to release the\nouter net ref, so all three nfsd_net_try_get() increments are\nbalanced on the error branch.","state":0,"publishedAt":"2026-09-11T19:46:29.227+00:00","modifiedAt":"2026-10-19T08:51:28.178+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/nfs_common/nfslocalio.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"fdd015de767977f21892329af5e12276eb80375f\",\n                            \"lessThan\": \"5215e734bf7cba18237155f8cb2a0accb60ca339\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fdd015de767977f21892329af5e12276eb80375f\",\n                            \"lessThan\": \"9f59b05423ed381f8cdeaaae4bd6778adcb6865c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fdd015de767977f21892329af5e12276eb80375f\",\n                            \"lessThan\": \"ca018c19e0ba38975e5ddc3ef8117d5b734313aa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"55735dc5a0ee0c0fc14cb51e005eae862906a410\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7cac8a129fc53497f9ee5d66fca55a245d009b97\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.15.10\",\n                            \"lessThan\": \"6.16\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.16.1\",\n                            \"lessThan\": \"6.17\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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/nfs_common/nfslocalio.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.17\",\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/5215e734bf7cba18237155f8cb2a0accb60ca339","https://git.kernel.org/stable/c/9f59b05423ed381f8cdeaaae4bd6778adcb6865c","https://git.kernel.org/stable/c/ca018c19e0ba38975e5ddc3ef8117d5b734313aa"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89715","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89715","identifiers":["CVE-2026-89715"]},"retained":false,"historicalAffected":[]}],"coverage":[]}