{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"MEDIUM" }, "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\nfsnotify: fix inode reference leak in fsnotify_recalc_mask()\n\nfsnotify_recalc_mask() fails to handle the return value of\n__fsnotify_recalc_mask(), which may return an inode pointer that needs\nto be released via fsnotify_drop_object() when the connector's HAS_IREF\nflag transitions from set to cleared.\n\nThis manifests as a hung task with the following call trace:\n\n INFO: task umount:1234 blocked for more than 120 seconds.\n Call Trace:\n __schedule\n schedule\n fsnotify_sb_delete\n generic_shutdown_super\n kill_anon_super\n cleanup_mnt\n task_work_run\n do_exit\n do_group_exit\n\nThe race window that triggers the iref leak:\n\n Thread A (adding mark) Thread B (removing mark)\n ────────────────────── ────────────────────────\n fsnotify_add_mark_locked():\n fsnotify_add_mark_list():\n spin_lock(conn->lock)\n add mark_B(evictable) to list\n spin_unlock(conn->lock)\n return\n\n /* ---- gap: no lock held ---- */\n\n fsnotify_detach_mark(mark_A):\n spin_lock(mark_A->lock)\n clear ATTACHED flag on mark_A\n spin_unlock(mark_A->lock)\n fsnotify_put_mark(mark_A)\n\n fsnotify_recalc_mask():\n spin_lock(conn->lock)\n __fsnotify_recalc_mask():\n /* mark_A skipped: ATTACHED cleared */\n /* only mark_B(evictable) remains */\n want_iref = false\n has_iref = true /* not yet cleared */\n -> HAS_IREF transitions true -> false\n -> returns inode pointer\n spin_unlock(conn->lock)\n /* BUG: return value discarded!\n * iput() and fsnotify_put_sb_watched_objects()\n * are never called */\n\nFix this by deferring the transition true -> false of HAS_IREF flag from\nfsnotify_recalc_mask() (Thread A) to fsnotify_put_mark() (thread B).", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52990" }, { "summary":"CVE-2026-52990 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-52990.json" }, { "summary":"openEuler-SA-2026-3455", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3455" }, { "summary":"CVE-2026-52990", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-52990&packageName=kernel" } ], "title":"openEuler cve CVE-2026-52990", "tracking":{ "initial_release_date":"2026-08-26T11:13:43+08:00", "revision_history":[ { "date":"2026-08-26T11:13:43+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-08-26T11:13:43+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, 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schedule\n fsnotify_sb_delete\n generic_shutdown_super\n kill_anon_super\n cleanup_mnt\n task_work_run\n do_exit\n do_group_exit\n\nThe race window that triggers the iref leak:\n\n Thread A (adding mark) Thread B (removing mark)\n ────────────────────── ────────────────────────\n fsnotify_add_mark_locked():\n fsnotify_add_mark_list():\n spin_lock(conn->lock)\n add mark_B(evictable) to list\n spin_unlock(conn->lock)\n return\n\n /* ---- gap: no lock held ---- */\n\n fsnotify_detach_mark(mark_A):\n spin_lock(mark_A->lock)\n clear ATTACHED flag on mark_A\n spin_unlock(mark_A->lock)\n fsnotify_put_mark(mark_A)\n\n fsnotify_recalc_mask():\n spin_lock(conn->lock)\n __fsnotify_recalc_mask():\n /* mark_A skipped: ATTACHED cleared */\n /* only mark_B(evictable) remains */\n want_iref = false\n has_iref = true /* not yet cleared */\n -> HAS_IREF transitions true -> false\n -> returns inode pointer\n spin_unlock(conn->lock)\n /* BUG: return value discarded!\n * iput() and fsnotify_put_sb_watched_objects()\n * are never called */\n\nFix this by deferring the transition true -> false of HAS_IREF flag from\nfsnotify_recalc_mask() (Thread A) to fsnotify_put_mark() (thread B).", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS-SP3:bpftool-6.6.0-145.3.26.157.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:bpftool-debuginfo-6.6.0-145.3.26.157.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-6.6.0-145.3.26.157.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-debuginfo-6.6.0-145.3.26.157.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-debugsource-6.6.0-145.3.26.157.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-devel-6.6.0-145.3.26.157.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-extra-modules-6.6.0-145.3.26.157.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-headers-6.6.0-145.3.26.157.oe2403sp3.aarch64", 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