{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53050",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53050"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "quota: Fix race of dquot_scan_active() with quota deactivation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nquota: Fix race of dquot_scan_active() with quota deactivation\n\ndquot_scan_active() can race with quota deactivation in\nquota_release_workfn() like:\n\n  CPU0 (quota_release_workfn)         CPU1 (dquot_scan_active)\n  ==============================      ==============================\n  spin_lock(&dq_list_lock);\n  list_replace_init(\n    &releasing_dquots, &rls_head);\n    /* dquot X on rls_head,\n       dq_count == 0,\n       DQ_ACTIVE_B still set */\n  spin_unlock(&dq_list_lock);\n  synchronize_srcu(&dquot_srcu);\n                                      spin_lock(&dq_list_lock);\n                                      list_for_each_entry(dquot,\n                                          &inuse_list, dq_inuse) {\n                                        /* finds dquot X */\n                                        dquot_active(X) -> true\n                                        atomic_inc(&X->dq_count);\n                                      }\n                                      spin_unlock(&dq_list_lock);\n  spin_lock(&dq_list_lock);\n  dquot = list_first_entry(&rls_head);\n  WARN_ON_ONCE(atomic_read(&dquot->dq_count));\n\nThe problem is not only a cosmetic one as under memory pressure the\ncaller of dquot_scan_active() can end up working on freed dquot.\n\nFix the problem by making sure the dquot is removed from releasing list\nwhen we acquire a reference to it.",
  "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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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53050"
    },
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      "url": "https://git.kernel.org/stable/c/2bdc80f4619411e5bd4a3ef23f51e14021ed457c"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable path is reached through local filesystem quota activity on a mounted OCFS2 filesystem, via ordinary dquot lifetime changes racing with the OCFS2 quota sync worker. It is not reachable by remote packets or adjacent/physical input.\nAC:L - This is a race, but a local attacker can repeatedly churn dquot references with filesystem operations while the periodic scanner runs. When uncertain, the higher-severity AC:L is appropriate.\nPR:L - After OCFS2 quotas are enabled, an unprivileged local user with write access to the filesystem can trigger dquot allocation and release paths. Mounting/configuring quotas is an environmental prerequisite, not a privilege needed for each exploit attempt.\nUI:N - No victim interaction is required once the affected filesystem is mounted and quotas are active. The attacker can trigger the relevant filesystem operations directly.\nS:U - The impact remains within the kernel and the same host security authority. There is no VM escape, IOMMU bypass, or cross-authority boundary change.\nC:H - The bug can lead to use-after-free of a dquot object under memory pressure. Kernel UAF conditions can be leveraged for memory disclosure, so confidentiality impact is High.\nI:H - The stale dquot/list state creates kernel heap use-after-free/list corruption, which can plausibly be shaped into write primitives or code execution. Integrity impact is therefore High.\nA:H - The race already produces kernel WARN/oops-style failure conditions and can dereference freed kernel objects. This can crash or destabilize the kernel, so availability impact is High."
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}