fkie_cve-2021-47493
Vulnerability from fkie_nvd
Published
2024-05-22 09:15
Modified
2025-09-24 19:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: fix race between searching chunks and release journal_head from buffer_head
Encountered a race between ocfs2_test_bg_bit_allocatable() and
jbd2_journal_put_journal_head() resulting in the below vmcore.
PID: 106879 TASK: ffff880244ba9c00 CPU: 2 COMMAND: "loop3"
Call trace:
panic
oops_end
no_context
__bad_area_nosemaphore
bad_area_nosemaphore
__do_page_fault
do_page_fault
page_fault
[exception RIP: ocfs2_block_group_find_clear_bits+316]
ocfs2_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]
ocfs2_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
When ocfs2_test_bg_bit_allocatable() called bh2jh(bg_bh), the
bg_bh->b_private NULL as jbd2_journal_put_journal_head() raced and
released the jounal head from the buffer head. Needed to take bit lock
for the bit 'BH_JournalHead' to fix this race.
References
Impacted products
Vendor | Product | Version | |
---|---|---|---|
linux | linux_kernel | * | |
linux | linux_kernel | * | |
linux | linux_kernel | 5.15 | |
linux | linux_kernel | 5.15 | |
linux | linux_kernel | 5.15 | |
linux | linux_kernel | 5.15 | |
linux | linux_kernel | 5.15 | |
linux | linux_kernel | 5.15 | |
linux | linux_kernel | 5.15 |
{ "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "DF93F2A0-1BCC-4EC3-AF79-F186B97DF86D", "versionEndExcluding": "5.10.77", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2681B950-4548-4649-A9E1-4124B59FC09C", "versionEndExcluding": "5.14.16", "versionStartIncluding": "5.11", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*", "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*", "matchCriteriaId": "60134C3A-06E4-48C1-B04F-2903732A4E56", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*", "matchCriteriaId": "0460DA88-8FE1-46A2-9DDA-1F1ABA552E71", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*", "matchCriteriaId": "AF55383D-4DF2-45DC-93F7-571F4F978EAB", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*", "matchCriteriaId": "9E9481B2-8AA6-4CBD-B5D3-C10F51FF6D01", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*", "matchCriteriaId": "EBD45831-4B79-42BC-ABC0-86870F0DEA89", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc7:*:*:*:*:*:*", "matchCriteriaId": "948A6B8D-1B72-4945-8680-354E53BE1C80", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix race between searching chunks and release journal_head from buffer_head\n\nEncountered a race between ocfs2_test_bg_bit_allocatable() and\njbd2_journal_put_journal_head() resulting in the below vmcore.\n\n PID: 106879 TASK: ffff880244ba9c00 CPU: 2 COMMAND: \"loop3\"\n Call trace:\n panic\n oops_end\n no_context\n __bad_area_nosemaphore\n bad_area_nosemaphore\n __do_page_fault\n do_page_fault\n page_fault\n [exception RIP: ocfs2_block_group_find_clear_bits+316]\n ocfs2_block_group_find_clear_bits [ocfs2]\n ocfs2_cluster_group_search [ocfs2]\n ocfs2_search_chain [ocfs2]\n ocfs2_claim_suballoc_bits [ocfs2]\n __ocfs2_claim_clusters [ocfs2]\n ocfs2_claim_clusters [ocfs2]\n ocfs2_local_alloc_slide_window [ocfs2]\n ocfs2_reserve_local_alloc_bits [ocfs2]\n ocfs2_reserve_clusters_with_limit [ocfs2]\n ocfs2_reserve_clusters [ocfs2]\n ocfs2_lock_refcount_allocators [ocfs2]\n ocfs2_make_clusters_writable [ocfs2]\n ocfs2_replace_cow [ocfs2]\n ocfs2_refcount_cow [ocfs2]\n ocfs2_file_write_iter [ocfs2]\n lo_rw_aio\n loop_queue_work\n kthread_worker_fn\n kthread\n ret_from_fork\n\nWhen ocfs2_test_bg_bit_allocatable() called bh2jh(bg_bh), the\nbg_bh-\u003eb_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 \u0027BH_JournalHead\u0027 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-\u0026gt;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 \u0027BH_JournalHead\u0027 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" } ] }
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Sightings
Author | Source | Type | Date |
---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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