{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53050", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.381Z", "datePublished": "2026-06-24T16:29:56.043Z", "dateUpdated": "2026-08-05T12:32:56.160Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:56.160Z"}, "descriptions": [{"lang": "en", "value": "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/quota/dquot.c", "include/linux/quotaops.h"], "versions": [{"version": "22c06bf1f99ec3ec16b1a81342becba4c59a1f16", "lessThan": "2bdc80f4619411e5bd4a3ef23f51e14021ed457c", "status": "affected", "versionType": "git"}, {"version": "56e96b38d2f7cd95b3c30eb70decac7233915e0a", "lessThan": "f9438cb8c8ec3adc84b2b450a3aab0123d074c3b", "status": "affected", "versionType": "git"}, {"version": "12a820a9923c11e8e898da9f82c8aded70cdcd16", "lessThan": "ac8a2e0d287ebf35e5d7e51e260b4e146648ba4a", "status": "affected", "versionType": "git"}, {"version": "869b6ea1609f655a43251bf41757aa44e5350a8f", "lessThan": "6678dde265708003c2b42551af4a2e3cb05decd5", "status": "affected", "versionType": "git"}, {"version": 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&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."}], "id": "CVE-2026-53050", "lastModified": "2026-07-21T17:23:37.577", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-06-24T17:17:16.887", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2bdc80f4619411e5bd4a3ef23f51e14021ed457c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/61e25f664dc2a08299e07d84c85776abc2350f75"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6678dde265708003c2b42551af4a2e3cb05decd5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/82cbdb4c1ebb5ea7d7bd45c18d3483b5bd32ebc1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac8a2e0d287ebf35e5d7e51e260b4e146648ba4a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e93ab401da4b2e2c1b8ef2424de2f238d51c8b2d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9438cb8c8ec3adc84b2b450a3aab0123d074c3b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fdd424d7c35633ac577fd87d1b043d1b8a6cd350"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: quota: Fix race of dquot_scan_active() with quota deactivation", "id": "2492263", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492263"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-366", "details": ["A flaw was found in the Linux kernel. A race condition exists between the dquot_scan_active() function and quota deactivation within quota_release_workfn(). This vulnerability could allow a local attacker to cause memory corruption by manipulating quota operations, potentially leading to system instability or a denial of service (DoS)."], "name": "CVE-2026-53050", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53050\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53050\nhttps://lore.kernel.org/linux-cve-announce/2026062459-CVE-2026-53050-d4d4@gregkh/T"], "threat_severity": "Moderate"}

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