{ "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": "869b6ea1609f655a43251bf41757aa44e5350a8f", "lessThan": "61e25f664dc2a08299e07d84c85776abc2350f75", "status": "affected", "versionType": "git" }, { "version": "869b6ea1609f655a43251bf41757aa44e5350a8f", "lessThan": "fdd424d7c35633ac577fd87d1b043d1b8a6cd350", "status": "affected", "versionType": "git" }, { "version": "869b6ea1609f655a43251bf41757aa44e5350a8f", "lessThan": "82cbdb4c1ebb5ea7d7bd45c18d3483b5bd32ebc1", "status": "affected", "versionType": "git" }, { "version": "869b6ea1609f655a43251bf41757aa44e5350a8f", "lessThan": "e93ab401da4b2e2c1b8ef2424de2f238d51c8b2d", "status": "affected", "versionType": "git" }, { "version": "bb7e3a019b52d829949d02b64ebab37838148fbf", "status": "affected", "versionType": "git" }, { "version": "061a18239ced5eb086967a2b4451cb1cc5ce0702", "status": "affected", "versionType": "git" }, { "version": "2a1ddddba6541143c8f73962f3021f1789114284", "status": "affected", "versionType": "git" }, { "version": "5.10.199", "lessThan": "5.10.258", "status": "affected", "versionType": "semver" }, { "version": "5.15.136", "lessThan": "5.15.209", "status": "affected", "versionType": "semver" }, { "version": "6.1.59", "lessThan": "6.1.175", "status": "affected", "versionType": "semver" }, { "version": "4.19.297", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "5.4.259", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "6.5.8", "lessThan": "6.6", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/quota/dquot.c", "include/linux/quotaops.h" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.199", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.136", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.59", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.297" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2bdc80f4619411e5bd4a3ef23f51e14021ed457c" }, { "url": "https://git.kernel.org/stable/c/f9438cb8c8ec3adc84b2b450a3aab0123d074c3b" }, { "url": "https://git.kernel.org/stable/c/ac8a2e0d287ebf35e5d7e51e260b4e146648ba4a" }, { "url": "https://git.kernel.org/stable/c/6678dde265708003c2b42551af4a2e3cb05decd5" }, { "url": "https://git.kernel.org/stable/c/61e25f664dc2a08299e07d84c85776abc2350f75" }, { "url": "https://git.kernel.org/stable/c/fdd424d7c35633ac577fd87d1b043d1b8a6cd350" }, { "url": "https://git.kernel.org/stable/c/82cbdb4c1ebb5ea7d7bd45c18d3483b5bd32ebc1" }, { "url": "https://git.kernel.org/stable/c/e93ab401da4b2e2c1b8ef2424de2f238d51c8b2d" } ], "title": "quota: Fix race of dquot_scan_active() with quota deactivation", "x_generator": { "engine": "bippy-1.2.0" } } } }