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CVE-2024-49966 (GCVE-0-2024-49966)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2026-08-05 11:40
VLAI
Title
ocfs2: cancel dqi_sync_work before freeing oinfo
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: cancel dqi_sync_work before freeing oinfo ocfs2_global_read_info() will initialize and schedule dqi_sync_work at the end, if error occurs after successfully reading global quota, it will trigger the following warning with CONFIG_DEBUG_OBJECTS_* enabled: ODEBUG: free active (active state 0) object: 00000000d8b0ce28 object type: timer_list hint: qsync_work_fn+0x0/0x16c This reports that there is an active delayed work when freeing oinfo in error handling, so cancel dqi_sync_work first. BTW, return status instead of -1 when .read_file_info fails.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:34 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < fc5cc716dfbdc5fd5f373ff3b51358174cf88bfc (git)
Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < 89043e7ed63c7fc141e68ea5a79758ed24b6c699 (git)
Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < 14114d8148db07e7946fb06b56a50cfa425e26c7 (git)
Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < 4173d1277c00baeedaaca76783e98b8fd0e3c08d (git)
Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < bbf41277df8b33fbedf4750a9300c147e8f104eb (git)
Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < ef768020366f47d23f39c4f57bcb03af6d1e24b3 (git)
Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < a4346c04d055bf7e184c18a73dbd23b6a9811118 (git)
Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < 0d707a33c84b371cb66120e198eed3374726ddd8 (git)
Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < 35fccce29feb3706f649726d410122dd81b92c18 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 4.19.323 , ≤ 4.19.* (semver)
Unaffected: 5.4.285 , ≤ 5.4.* (semver)
Unaffected: 5.10.227 , ≤ 5.10.* (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: cancel dqi_sync_work before freeing oinfo\n\nocfs2_global_read_info() will initialize and schedule dqi_sync_work at the\nend, if error occurs after successfully reading global quota, it will\ntrigger the following warning with CONFIG_DEBUG_OBJECTS_* enabled:\n\nODEBUG: free active (active state 0) object: 00000000d8b0ce28 object type: timer_list hint: qsync_work_fn+0x0/0x16c\n\nThis reports that there is an active delayed work when freeing oinfo in\nerror handling, so cancel dqi_sync_work first.  BTW, return status instead\nof -1 when .read_file_info fails."
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ocfs2: cancelar dqi_sync_work antes de liberar oinfo ocfs2_global_read_info() inicializar\u00e1 y programar\u00e1 dqi_sync_work al final, si ocurre un error despu\u00e9s de leer exitosamente la cuota global, activar\u00e1 la siguiente advertencia con CONFIG_DEBUG_OBJECTS_* habilitado: ODEBUG: free active (active state 0) object: 00000000d8b0ce28 object type: timer_list hint: qsync_work_fn+0x0/0x16c Esto informa que hay un trabajo retrasado activo al liberar oinfo en el manejo de errores, as\u00ed que cancele dqi_sync_work primero. POR CIERTO, devuelva el estado en lugar de -1 cuando .read_file_info falle."
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                  "version": "6.1.113",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.55",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.10.*",
                  "status": "unaffected",
                  "version": "6.10.14",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.11.*",
                  "status": "unaffected",
                  "version": "6.11.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.12",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.323",
                      "versionStartIncluding": "2.6.29",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.285",
                      "versionStartIncluding": "2.6.29",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.227",
                      "versionStartIncluding": "2.6.29",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.168",
                      "versionStartIncluding": "2.6.29",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.113",
                      "versionStartIncluding": "2.6.29",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.55",
                      "versionStartIncluding": "2.6.29",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.10.14",
                      "versionStartIncluding": "2.6.29",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.11.3",
                      "versionStartIncluding": "2.6.29",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12",
                      "versionStartIncluding": "2.6.29",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: cancel dqi_sync_work before freeing oinfo\n\nocfs2_global_read_info() will initialize and schedule dqi_sync_work at the\nend, if error occurs after successfully reading global quota, it will\ntrigger the following warning with CONFIG_DEBUG_OBJECTS_* enabled:\n\nODEBUG: free active (active state 0) object: 00000000d8b0ce28 object type: timer_list hint: qsync_work_fn+0x0/0x16c\n\nThis reports that there is an active delayed work when freeing oinfo in\nerror handling, so cancel dqi_sync_work first.  BTW, return status instead\nof -1 when .read_file_info fails."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable path is entered only through `ocfs2_enable_quotas()`/`ocfs2_remount()` when an ocfs2 image is mounted locally, so the attacker needs local access to present the crafted block device or image file. There is no remote or adjacent-network data path into `ocfs2_local_read_info()`.\nAC:L - The attacker authors the on-disk image and therefore controls both the failure trigger (unvalidated `dqi_chunks`/quota-block ECC guaranteeing an error after `ocfs2_global_read_info()` succeeds) and `dqi_syncms`, which sets the exact delay before the freed timer fires \u2014 giving a deterministic, repeatable free-then-spray-then-fire window. No condition outside the attacker\u0027s influence is required.\nPR:L - In the realistic worst case a low-privileged local user supplies the crafted image on removable media or via a delegated/`user` fstab mount and a privileged automounter (udisks2/systemd) performs the mount, so the attacker themself holds only unprivileged credentials. Per the uncertainty rule the lower privilege tier is taken over requiring real CAP_SYS_ADMIN.\nUI:N - On desktop, kiosk and shared-workstation deployments the mount is performed automatically by the automount daemon on media insertion \u2014 an action the attacker performs \u2014 so no separate victim interaction is needed.\nS:U - The freed object, the timer wheel and the work handler all live within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab use-after-free: the attacker can reallocate the freed `ocfs2_mem_dqinfo` and have `qsync_work_fn()` dereference an attacker-chosen `dqi_gqinode`/`i_sb`, and `dquot_scan_active()` then walks structures at attacker-influenced addresses, yielding an arbitrary-read primitive.\nI:H - `expire_timers()` reads `timer-\u003efunction` from the freed object and calls it while `detach_timer()` writes back into it, so a successful heap spray gives a controlled indirect call and write primitive \u2014 full control-flow hijack, not merely state corruption.\nA:H - Even unexploited the dangling timer causes a wild function-pointer call or NULL/garbage dereference in softirq context, producing a kernel oops or panic; with debug objects enabled it trips the ODEBUG \"free active object\" report."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:40:45.084Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/fc5cc716dfbdc5fd5f373ff3b51358174cf88bfc"
            },
            {
              "url": "https://git.kernel.org/stable/c/89043e7ed63c7fc141e68ea5a79758ed24b6c699"
            },
            {
              "url": "https://git.kernel.org/stable/c/14114d8148db07e7946fb06b56a50cfa425e26c7"
            },
            {
              "url": "https://git.kernel.org/stable/c/4173d1277c00baeedaaca76783e98b8fd0e3c08d"
            },
            {
              "url": "https://git.kernel.org/stable/c/bbf41277df8b33fbedf4750a9300c147e8f104eb"
            },
            {
              "url": "https://git.kernel.org/stable/c/ef768020366f47d23f39c4f57bcb03af6d1e24b3"
            },
            {
              "url": "https://git.kernel.org/stable/c/a4346c04d055bf7e184c18a73dbd23b6a9811118"
            },
            {
              "url": "https://git.kernel.org/stable/c/0d707a33c84b371cb66120e198eed3374726ddd8"
            },
            {
              "url": "https://git.kernel.org/stable/c/35fccce29feb3706f649726d410122dd81b92c18"
            }
          ],
          "title": "ocfs2: cancel dqi_sync_work before freeing oinfo",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-49966",
        "datePublished": "2024-10-21T18:02:17.076Z",
        "dateReserved": "2024-10-21T12:17:06.050Z",
        "dateUpdated": "2026-08-05T11:40:45.084Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.