CVE-2021-47493 (GCVE-0-2021-47493)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2026-05-11 13:55
VLAI
Title
ocfs2: fix race between searching chunks and release journal_head from buffer_head
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 5043fbd294f5909a080ade0f04b70a4da9e122b7 (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 2e382600e8856ea654677b5134ee66e03ea72bc2 (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 6f1b228529ae49b0f85ab89bcdb6c365df401558 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.16
Unaffected: 0 , < 2.6.16 (semver)
Unaffected: 5.10.77 , ≤ 5.10.* (semver)
Unaffected: 5.14.16 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47493",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-06-06T18:35:17.607326Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-06T18:35:30.175Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:39:59.750Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/suballoc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5043fbd294f5909a080ade0f04b70a4da9e122b7",
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "versionType": "git"
            },
            {
              "lessThan": "2e382600e8856ea654677b5134ee66e03ea72bc2",
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "versionType": "git"
            },
            {
              "lessThan": "6f1b228529ae49b0f85ab89bcdb6c365df401558",
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/suballoc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.16"
            },
            {
              "lessThan": "2.6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.77",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.14.*",
              "status": "unaffected",
              "version": "5.14.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.77",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.14.16",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T13:55:42.957Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558"
        }
      ],
      "title": "ocfs2: fix race between searching chunks and release journal_head from buffer_head",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47493",
    "datePublished": "2024-05-22T08:19:41.419Z",
    "dateReserved": "2024-05-22T06:20:56.201Z",
    "dateUpdated": "2026-05-11T13:55:42.957Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-47493",
      "date": "2026-06-17",
      "epss": "0.00164",
      "percentile": "0.05967"
    },
    "fkie_nvd": {
      "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": "2024-11-21T06:36:19.610",
      "published": "2024-05-22T09:15:11.100",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47493\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T09:15:11.100\",\"lastModified\":\"2025-09-24T19:11:04.460\",\"vulnStatus\":\"Analyzed\",\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.10.77\",\"matchCriteriaId\":\"DF93F2A0-1BCC-4EC3-AF79-F186B97DF86D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.14.16\",\"matchCriteriaId\":\"2681B950-4548-4649-A9E1-4124B59FC09C\"},{\"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\"}]}]}],\"references\":[{\"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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"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\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.750Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47493\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-06T18:35:17.607326Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-06T18:35:25.585Z\"}}], \"cna\": {\"title\": \"ocfs2: fix race between searching chunks and release journal_head from buffer_head\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"5043fbd294f5909a080ade0f04b70a4da9e122b7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"2e382600e8856ea654677b5134ee66e03ea72bc2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"6f1b228529ae49b0f85ab89bcdb6c365df401558\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ocfs2/suballoc.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.10.77\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ocfs2/suballoc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7\"}, {\"url\": \"https://git.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2\"}, {\"url\": \"https://git.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.77\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-10T07:12:04.249Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47493\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-10T07:12:04.249Z\", \"dateReserved\": \"2024-05-22T06:20:56.201Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T08:19:41.419Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.