{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-49966",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-49966"
  ],
  "published": "2024-10-21T18:02:47Z",
  "summary": "ocfs2: cancel dqi_sync_work before freeing oinfo",
  "details": "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-49966"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fc5cc716dfbdc5fd5f373ff3b51358174cf88bfc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/89043e7ed63c7fc141e68ea5a79758ed24b6c699"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/14114d8148db07e7946fb06b56a50cfa425e26c7"
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    {
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      "url": "https://git.kernel.org/stable/c/4173d1277c00baeedaaca76783e98b8fd0e3c08d"
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    {
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      "url": "https://git.kernel.org/stable/c/bbf41277df8b33fbedf4750a9300c147e8f104eb"
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    },
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      "url": "https://git.kernel.org/stable/c/a4346c04d055bf7e184c18a73dbd23b6a9811118"
    },
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      "url": "https://git.kernel.org/stable/c/0d707a33c84b371cb66120e198eed3374726ddd8"
    },
    {
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      "url": "https://git.kernel.org/stable/c/35fccce29feb3706f649726d410122dd81b92c18"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "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's 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's 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->function` 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."
    }
  }
}