GHSA-4MF5-RJC5-62QC
Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-09-08 09:35In the Linux kernel, the following vulnerability has been resolved:
quota: Fix race of dquot_scan_active() with quota deactivation
dquot_scan_active() can race with quota deactivation in quota_release_workfn() like:
CPU0 (quota_release_workfn) CPU1 (dquot_scan_active) ============================== ============================== spin_lock(&dq_list_lock); list_replace_init( &releasing_dquots, &rls_head); / dquot X on rls_head, dq_count == 0, DQ_ACTIVE_B still set / spin_unlock(&dq_list_lock); synchronize_srcu(&dquot_srcu); spin_lock(&dq_list_lock); list_for_each_entry(dquot, &inuse_list, dq_inuse) { / finds dquot X / dquot_active(X) -> true atomic_inc(&X->dq_count); } spin_unlock(&dq_list_lock); spin_lock(&dq_list_lock); dquot = list_first_entry(&rls_head); WARN_ON_ONCE(atomic_read(&dquot->dq_count));
The problem is not only a cosmetic one as under memory pressure the caller of dquot_scan_active() can end up working on freed dquot.
Fix the problem by making sure the dquot is removed from releasing list when we acquire a reference to it.
{
"affected": [],
"aliases": [
"CVE-2026-53050"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-24T17:17:16Z",
"severity": "HIGH"
},
"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(\u0026dq_list_lock);\n list_replace_init(\n \u0026releasing_dquots, \u0026rls_head);\n /* dquot X on rls_head,\n dq_count == 0,\n DQ_ACTIVE_B still set */\n spin_unlock(\u0026dq_list_lock);\n synchronize_srcu(\u0026dquot_srcu);\n spin_lock(\u0026dq_list_lock);\n list_for_each_entry(dquot,\n \u0026inuse_list, dq_inuse) {\n /* finds dquot X */\n dquot_active(X) -\u003e true\n atomic_inc(\u0026X-\u003edq_count);\n }\n spin_unlock(\u0026dq_list_lock);\n spin_lock(\u0026dq_list_lock);\n dquot = list_first_entry(\u0026rls_head);\n WARN_ON_ONCE(atomic_read(\u0026dquot-\u003edq_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.",
"id": "GHSA-4mf5-rjc5-62qc",
"modified": "2026-09-08T09:35:33Z",
"published": "2026-06-24T18:32:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53050"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2bdc80f4619411e5bd4a3ef23f51e14021ed457c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/61e25f664dc2a08299e07d84c85776abc2350f75"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6678dde265708003c2b42551af4a2e3cb05decd5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/82cbdb4c1ebb5ea7d7bd45c18d3483b5bd32ebc1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ac8a2e0d287ebf35e5d7e51e260b4e146648ba4a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e93ab401da4b2e2c1b8ef2424de2f238d51c8b2d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f9438cb8c8ec3adc84b2b450a3aab0123d074c3b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fdd424d7c35633ac577fd87d1b043d1b8a6cd350"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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