{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: revoke copy-notify stateids before dropping their reference\n\nCopy-notify stateids live in the s2s_cp_stateids IDR and on their parent\nstid's sc_cp_list, pinned by a single membership reference.\n_free_cpntf_state_locked() only unlinks an entry once its refcount reaches\nzero, so any revoke path that runs while a concurrent\nfind_cpntf_state()/manage_cpntf_state() holder has elevated cs_count drops\nthe reference without unlinking, leaving the entry discoverable with its\nmembership reference already consumed. A second revoke or a laundromat tick\nthen frees it while the reader still holds the pointer -- a\nKASAN-detectable use-after-free at the reader's nfs4_put_cpntf_state().\n\nThis affected all three revoke paths:\n\n - The parent-stid drain (nfs4_free_cpntf_statelist()) repeatedly called\n _free_cpntf_state_locked() on the first list entry; a holder that had\n bumped cs_count made it return early, so the next iteration\n re-decremented and burned the holder's reference.\n\n - OFFLOAD_CANCEL (manage_cpntf_state()) and laundromat expiry likewise\n used _free_cpntf_state_locked() and could drop 2->1 without unlinking.\n\nAdd revoke_cpntf_state_locked(), which unhashes the entry from the IDR and\nsc_cp_list first (deferring the final free to any holder), and use it from\nall three revoke paths. The drain now walks with list_for_each_entry_safe()\nand revokes each entry unconditionally, so it terminates in one pass per\nentry regardless of cs_count. The unhash is gated on\n!list_empty(&cps->cp_list); the idr_remove() gate matters because\nidr_alloc_cyclic() may have recycled the so_id by then. Keep\n_free_cpntf_state_locked() for the reference-holder put path only, where a\nconcurrent revoke may already have unlinked the entry (its list_del_init()\nthen a no-op).", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89663" }, { "summary":"CVE-2026-89663 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-89663.json" }, { "summary":"openEuler-SA-2026-4357", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4357" }, { "summary":"CVE-2026-89663", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-89663&packageName=kernel" } ], "title":"openEuler cve CVE-2026-89663", "tracking":{ "initial_release_date":"2026-10-22T10:24:20+08:00", "revision_history":[ { "date":"2026-10-22T10:24:20+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-10-22T10:24:20+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-10-22T10:24:20+08:00", "id":"CVE-2026-89663", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"openEuler-22.03-LTS-SP4", "name":"openEuler-22.03-LTS-SP4" }, "name":"openEuler-22.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"bpftool-5.10.0-337.0.0.238.oe2203sp4.aarch64.rpm", "name":"bpftool-5.10.0-337.0.0.238.oe2203sp4.aarch64.rpm" }, "name":"bpftool-5.10.0-337.0.0.238.oe2203sp4.aarch64.rpm", 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"category":"default_component_of" } ] }, "vulnerabilities":[ { "cve":"CVE-2026-89663", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: revoke copy-notify stateids before dropping their reference\n\nCopy-notify stateids live in the s2s_cp_stateids IDR and on their parent\nstid's sc_cp_list, pinned by a single membership reference.\n_free_cpntf_state_locked() only unlinks an entry once its refcount reaches\nzero, so any revoke path that runs while a concurrent\nfind_cpntf_state()/manage_cpntf_state() holder has elevated cs_count drops\nthe reference without unlinking, leaving the entry discoverable with its\nmembership reference already consumed. A second revoke or a laundromat tick\nthen frees it while the reader still holds the pointer -- a\nKASAN-detectable use-after-free at the reader's nfs4_put_cpntf_state().\n\nThis affected all three revoke paths:\n\n - The parent-stid drain (nfs4_free_cpntf_statelist()) repeatedly called\n _free_cpntf_state_locked() on the first list entry; a holder that had\n bumped cs_count made it return early, so the next iteration\n re-decremented and burned the holder's reference.\n\n - OFFLOAD_CANCEL (manage_cpntf_state()) and laundromat expiry likewise\n used _free_cpntf_state_locked() and could drop 2->1 without unlinking.\n\nAdd revoke_cpntf_state_locked(), which unhashes the entry from the IDR and\nsc_cp_list first (deferring the final free to any holder), and use it from\nall three revoke paths. The drain now walks with list_for_each_entry_safe()\nand revokes each entry unconditionally, so it terminates in one pass per\nentry regardless of cs_count. The unhash is gated on\n!list_empty(&cps->cp_list); the idr_remove() gate matters because\nidr_alloc_cyclic() may have recycled the so_id by then. Keep\n_free_cpntf_state_locked() for the reference-holder put path only, where a\nconcurrent revoke may already have unlinked the entry (its list_del_init()\nthen a no-op).", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-337.0.0.238.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-337.0.0.238.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-337.0.0.238.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-337.0.0.238.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-337.0.0.238.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-337.0.0.238.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-337.0.0.238.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-source-5.10.0-337.0.0.238.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-tools-5.10.0-337.0.0.238.oe2203sp4.aarch64", 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"openEuler-22.03-LTS-SP4:perf-debuginfo-5.10.0-337.0.0.238.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:python3-perf-5.10.0-337.0.0.238.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:python3-perf-debuginfo-5.10.0-337.0.0.238.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-337.0.0.238.oe2203sp4.src" ] } ], "threats":[ { "details":"High", "category":"impact" } ], "title":"CVE-2026-89663" } ] }