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Needed to take bit lock\nfor the bit 'BH_JournalHead' to fix this race."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ocfs2: corrige la ejecuci\u00f3n entre fragmentos de b\u00fasqueda y libera journal_head de buffer_head Se encontr\u00f3 una ejecuci\u00f3n entre ocfs2_test_bg_bit_allocatable() y jbd2_journal_put_journal_head() que result\u00f3 en el siguiente vmcore. PID: 106879 TAREA: ffff880244ba9c00 CPU: 2 COMANDO: \"loop3\" Rastreo de llamadas: p\u00e1nico oops_end no_context __bad_area_nosemaphore bad_area_nosemaphore __do_page_fault do_page_fault page_fault [excepci\u00f3n RIP: ocfs2_block_group_find_clear_bits+316] 2_block_group_find_clear_bits [ocfs2] ocfs2_cluster_group_search [ocfs2] ocfs2_search_chain [ocfs2] ocfs2_claim_suballoc_bits [ocfs2] __ocfs2_claim_clusters [ocfs2] ocfs2_claim_clusters [ocfs2] ocfs2_local_alloc_slide_window [ocfs2] ocfs2_reserve_local_alloc_bits [ocfs2] ocfs2_reserve_clusters_with_limit [ocfs2] ocfs2_reserve_clusters [ocfs2] ocfs2_lock_refcount_allocators [ocfs2] 2_make_clusters_writable [ocfs2] ocfs2_replace_cow [ocfs2] ocfs2_refcount_cow [ocfs2] ocfs2_file_write_iter [ocfs2] lo_rw_aio loop_queue_work kthread_worker_fn kthread ret_from_fork Cuando ocfs2_test_bg_bit_allocatable () llamado bh2jh(bg_bh), el bg_bh->b_private NULL como jbd2_journal_put_journal_head() corri\u00f3 y liber\u00f3 el encabezado del diario del encabezado del b\u00fafer. Era necesario bloquear el bit 'BH_JournalHead' para solucionar esta ejecuci\u00f3n."}], "id": "CVE-2021-47493", "lastModified": "2025-09-24T19:11:04.460", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-05-22T09:15:11.100", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ocfs2: fix race between searching chunks and release journal_head from buffer_head", "id": "2282922", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282922"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nocfs2: fix race between searching chunks and release journal_head from buffer_head\nEncountered a race between ocfs2_test_bg_bit_allocatable() and\njbd2_journal_put_journal_head() resulting in the below vmcore.\nPID: 106879 TASK: ffff880244ba9c00 CPU: 2 COMMAND: \"loop3\"\nCall trace:\npanic\noops_end\nno_context\n__bad_area_nosemaphore\nbad_area_nosemaphore\n__do_page_fault\ndo_page_fault\npage_fault\n[exception RIP: ocfs2_block_group_find_clear_bits+316]\nocfs2_block_group_find_clear_bits [ocfs2]\nocfs2_cluster_group_search [ocfs2]\nocfs2_search_chain [ocfs2]\nocfs2_claim_suballoc_bits [ocfs2]\n__ocfs2_claim_clusters [ocfs2]\nocfs2_claim_clusters [ocfs2]\nocfs2_local_alloc_slide_window [ocfs2]\nocfs2_reserve_local_alloc_bits [ocfs2]\nocfs2_reserve_clusters_with_limit [ocfs2]\nocfs2_reserve_clusters [ocfs2]\nocfs2_lock_refcount_allocators [ocfs2]\nocfs2_make_clusters_writable [ocfs2]\nocfs2_replace_cow [ocfs2]\nocfs2_refcount_cow [ocfs2]\nocfs2_file_write_iter [ocfs2]\nlo_rw_aio\nloop_queue_work\nkthread_worker_fn\nkthread\nret_from_fork\nWhen ocfs2_test_bg_bit_allocatable() called bh2jh(bg_bh), the\nbg_bh->b_private NULL as jbd2_journal_put_journal_head() raced and\nreleased the jounal head from the buffer head. Needed to take bit lock\nfor the bit 'BH_JournalHead' to fix this race."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2021-47493", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47493\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47493\nhttps://lore.kernel.org/linux-cve-announce/2024052241-CVE-2021-47493-24fb@gregkh/T"], "statement": "Red Hat Enterprise Linux is not vulnerable to this CVE, as it does not affect the versions or configurations of the Linux kernel used in its distributions.", "threat_severity": "Moderate"}

{"created": "2025-07-13T11:14:44.844701+00:00", "updated": "2025-07-13T11:14:44.844750+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}