{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"CRITICAL" }, "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: fix UAF in async copy cancel and shutdown\n\nAn async copy could be freed or used after free while a teardown caller\n(OFFLOAD_CANCEL, nfsd4_shutdown_copy, nfsd4_cancel_copy_by_sb) raced the\ncopy kthread:\n\n - find_async_copy() bumped copy->refcount but left the copy on\n clp->async_copies, so the reaper's cleanup_async_copy() could run\n release_copy_files() concurrently with a cancel/shutdown caller. Both\n put and NULL nf_src/nf_dst without a common lock, double-putting the\n nfsd_file and freeing it early.\n\n - nfsd4_do_async_copy() set NFSD4_COPY_F_STOPPED before its final uses\n of the copy (nfsd_update_cmtime_attr() on copy->nf_dst,\n nfsd4_send_cb_offload()). nfsd4_stop_copy() treats a set STOPPED bit\n as \"kthread done, skip kthread_stop()\", so a teardown caller ran\n release_copy_files() -- which puts and NULLs nf_dst -- while the\n kthread still dereferenced it (NULL/UAF).\n\n - copy->copy_task was never pinned. The one-shot kthread self-reaps on\n return, so kthread_stop()'s get_task_struct() could touch a freed\n task_struct.\n\n - co_cb is embedded in the copy, but nfsd4_send_cb_offload() held a\n reference only on the client, so a concurrent teardown could free\n the copy while the CB_OFFLOAD callback was in flight.\n\nFix the teardown lifetime as a whole:\n\n - find_async_copy() unlinks the copy (clear cp_clp, list_del_init)\n under async_lock; the cancel, shutdown, and sb-cancel paths drop the\n list-membership reference via nfs4_put_copy() after nfsd4_stop_copy().\n Drop the now-redundant list_del fixup from cleanup_async_copy().\n\n - Because unlinking hides the copy from the reaper, its\n cleanup_async_copy() can no longer remove the copy's s2s_cp_stateids\n entry; the cancel/shutdown/sb-cancel paths now call\n nfs4_free_copy_state() themselves (while cp_clp is still valid) so\n the entry does not dangle at freed memory for the laundromat and\n manage_cpntf_state() to dereference.\n\n - Give the kthread its own reference, taken in nfsd4_copy() before\n wake_up_process() and dropped at the end of nfsd4_do_async_copy();\n call wake_up_process() before list_add().\n\n - Pin the task_struct with get_task_struct() in nfsd4_copy(), released\n in nfs4_put_copy(), so kthread_stop() is safe whenever the kthread\n exits. Set NFSD4_COPY_F_STOPPED only in nfsd4_stop_copy(), which now\n always kthread_stop()s before release_copy_files(); completion is\n still reported via NFSD4_COPY_F_COMPLETED, so\n nfsd4_has_active_async_copies() is unaffected. Each teardown caller\n removes the copy from clp->async_copies first, so kthread_stop() runs\n exactly once.\n\n - Take a copy reference in nfsd4_send_cb_offload(), dropped in\n nfsd4_cb_offload_release(). The kthread still holds its own reference\n there, so the refcount_inc() cannot race the final free.\n\n - Read cp_clp with smp_load_acquire() to pair with the unordered\n set_bit()/clear_bit() writers (Documentation/atomic_bitops.rst).", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89675" }, { "summary":"CVE-2026-89675 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-89675.json" }, { "summary":"openEuler-SA-2026-4591", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4591" }, { "summary":"CVE-2026-89675", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-89675&packageName=kernel" } ], "title":"openEuler cve CVE-2026-89675", "tracking":{ "initial_release_date":"2026-10-30T11:21:29+08:00", "revision_history":[ { "date":"2026-10-30T11:21:29+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-10-30T11:21:29+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-10-30T11:21:29+08:00", "id":"CVE-2026-89675", "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":"src", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"kernel-5.10.0-339.0.0.240.oe2203sp4.src.rpm", "name":"kernel-5.10.0-339.0.0.240.oe2203sp4.src.rpm" }, 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"category":"default_component_of" } ] }, "vulnerabilities":[ { "cve":"CVE-2026-89675", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix UAF in async copy cancel and shutdown\n\nAn async copy could be freed or used after free while a teardown caller\n(OFFLOAD_CANCEL, nfsd4_shutdown_copy, nfsd4_cancel_copy_by_sb) raced the\ncopy kthread:\n\n - find_async_copy() bumped copy->refcount but left the copy on\n clp->async_copies, so the reaper's cleanup_async_copy() could run\n release_copy_files() concurrently with a cancel/shutdown caller. Both\n put and NULL nf_src/nf_dst without a common lock, double-putting the\n nfsd_file and freeing it early.\n\n - nfsd4_do_async_copy() set NFSD4_COPY_F_STOPPED before its final uses\n of the copy (nfsd_update_cmtime_attr() on copy->nf_dst,\n nfsd4_send_cb_offload()). nfsd4_stop_copy() treats a set STOPPED bit\n as \"kthread done, skip kthread_stop()\", so a teardown caller ran\n release_copy_files() -- which puts and NULLs nf_dst -- while the\n kthread still dereferenced it (NULL/UAF).\n\n - copy->copy_task was never pinned. The one-shot kthread self-reaps on\n return, so kthread_stop()'s get_task_struct() could touch a freed\n task_struct.\n\n - co_cb is embedded in the copy, but nfsd4_send_cb_offload() held a\n reference only on the client, so a concurrent teardown could free\n the copy while the CB_OFFLOAD callback was in flight.\n\nFix the teardown lifetime as a whole:\n\n - find_async_copy() unlinks the copy (clear cp_clp, list_del_init)\n under async_lock; the cancel, shutdown, and sb-cancel paths drop the\n list-membership reference via nfs4_put_copy() after nfsd4_stop_copy().\n Drop the now-redundant list_del fixup from cleanup_async_copy().\n\n - Because unlinking hides the copy from the reaper, its\n cleanup_async_copy() can no longer remove the copy's s2s_cp_stateids\n entry; the cancel/shutdown/sb-cancel paths now call\n nfs4_free_copy_state() themselves (while cp_clp is still valid) so\n the entry does not dangle at freed memory for the laundromat and\n manage_cpntf_state() to dereference.\n\n - Give the kthread its own reference, taken in nfsd4_copy() before\n wake_up_process() and dropped at the end of nfsd4_do_async_copy();\n call wake_up_process() before list_add().\n\n - Pin the task_struct with get_task_struct() in nfsd4_copy(), released\n in nfs4_put_copy(), so kthread_stop() is safe whenever the kthread\n exits. Set NFSD4_COPY_F_STOPPED only in nfsd4_stop_copy(), which now\n always kthread_stop()s before release_copy_files(); completion is\n still reported via NFSD4_COPY_F_COMPLETED, so\n nfsd4_has_active_async_copies() is unaffected. Each teardown caller\n removes the copy from clp->async_copies first, so kthread_stop() runs\n exactly once.\n\n - Take a copy reference in nfsd4_send_cb_offload(), dropped in\n nfsd4_cb_offload_release(). The kthread still holds its own reference\n there, so the refcount_inc() cannot race the final free.\n\n - Read cp_clp with smp_load_acquire() to pair with the unordered\n set_bit()/clear_bit() writers (Documentation/atomic_bitops.rst).", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:kernel-5.10.0-339.0.0.240.oe2203sp4.src", "openEuler-22.03-LTS-SP4:bpftool-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-339.0.0.240.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-339.0.0.240.oe2203sp4.aarch64", 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