CVE-2026-89715

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89715", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.751Z", "datePublished": "2026-09-11T19:46:29.227Z", "dateUpdated": "2026-10-19T08:51:28.178Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:51:28.178Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfs_common/nfslocalio.c"], "versions": [{"version": "fdd015de767977f21892329af5e12276eb80375f", "lessThan": "5215e734bf7cba18237155f8cb2a0accb60ca339", "status": "affected", "versionType": "git"}, {"version": "fdd015de767977f21892329af5e12276eb80375f", "lessThan": "9f59b05423ed381f8cdeaaae4bd6778adcb6865c", "status": "affected", "versionType": "git"}, {"version": "fdd015de767977f21892329af5e12276eb80375f", "lessThan": "ca018c19e0ba38975e5ddc3ef8117d5b734313aa", "status": "affected", "versionType": "git"}, {"version": "55735dc5a0ee0c0fc14cb51e005eae862906a410", "status": "affected", "versionType": "git"}, {"version": "7cac8a129fc53497f9ee5d66fca55a245d009b97", "status": "affected", "versionType": "git"}, {"version": "6.15.10", "lessThan": "6.16", "status": "affected", "versionType": "semver"}, {"version": "6.16.1", "lessThan": "6.17", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfs_common/nfslocalio.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "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": "6.17", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5215e734bf7cba18237155f8cb2a0accb60ca339"}, {"url": "https://git.kernel.org/stable/c/9f59b05423ed381f8cdeaaae4bd6778adcb6865c"}, {"url": "https://git.kernel.org/stable/c/ca018c19e0ba38975e5ddc3ef8117d5b734313aa"}], "title": "NFS/localio: fix ref leak on nfs_uuid_add_file failure", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfs_common/nfslocalio.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5215e734bf7cba18237155f8cb2a0accb60ca339", "status": "affected", "version": "fdd015de767977f21892329af5e12276eb80375f", "versionType": "git"}, {"lessThan": "9f59b05423ed381f8cdeaaae4bd6778adcb6865c", "status": "affected", "version": "fdd015de767977f21892329af5e12276eb80375f", "versionType": "git"}, {"lessThan": "ca018c19e0ba38975e5ddc3ef8117d5b734313aa", "status": "affected", "version": "fdd015de767977f21892329af5e12276eb80375f", "versionType": "git"}, {"status": "affected", "version": "55735dc5a0ee0c0fc14cb51e005eae862906a410", "versionType": "git"}, {"status": "affected", "version": "7cac8a129fc53497f9ee5d66fca55a245d009b97", "versionType": "git"}, {"lessThan": "6.16", "status": "affected", "version": "6.15.10", "versionType": "semver"}, {"lessThan": "6.17", "status": "affected", "version": "6.16.1", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfs_common/nfslocalio.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"lessThan": "6.17", "status": "unaffected", "version": "0", "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\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."}], "id": "CVE-2026-89715", "lastModified": "2026-10-19T09:18:10.470", "metrics": {}, "published": "2026-09-11T20:19:58.993", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5215e734bf7cba18237155f8cb2a0accb60ca339"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9f59b05423ed381f8cdeaaae4bd6778adcb6865c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ca018c19e0ba38975e5ddc3ef8117d5b734313aa"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel NFS/localio: Denial of Service due to reference leak", "id": "2532445", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532445"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/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 NFS/localio component. A race condition during file handling can lead to a reference leak, where system resources are not properly released. This continuous accumulation of unreleased references can exhaust available resources, preventing network namespace teardown and ultimately leading to a Denial of Service (DoS) condition."], "name": "CVE-2026-89715", "public_date": "2026-09-11T19:46:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89715\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89715\nhttps://git.kernel.org/stable/c/5215e734bf7cba18237155f8cb2a0accb60ca339\nhttps://git.kernel.org/stable/c/9f59b05423ed381f8cdeaaae4bd6778adcb6865c\nhttps://git.kernel.org/stable/c/ca018c19e0ba38975e5ddc3ef8117d5b734313aa"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fdd015de767977f21892329af5e12276eb80375f,5215e734bf7cba18237155f8cb2a0accb60ca339)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fdd015de767977f21892329af5e12276eb80375f,9f59b05423ed381f8cdeaaae4bd6778adcb6865c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fdd015de767977f21892329af5e12276eb80375f,ca018c19e0ba38975e5ddc3ef8117d5b734313aa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "55735dc5a0ee0c0fc14cb51e005eae862906a410"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "7cac8a129fc53497f9ee5d66fca55a245d009b97"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.15.10,6.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.16.1,6.17)"}}], "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": "6.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.17)"}}, {"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": "generic", "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": "2026-09-12T08:15:07.026203+00:00", "updated": "2026-09-15T19:30:12.149905+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}