CVE-2026-97521

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97521", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T16:01:01.152Z", "datePublished": "2026-09-24T16:05:21.667Z", "dateUpdated": "2026-09-28T05:30:59.436Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-28T05:30:59.436Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: fix quota init duplicate scan\n\ngfs2_quota_init() checks for duplicate quota_change IDs while holding\nqd_lock and the quota hash bucket bitlock. That path used\ngfs2_qd_search_bucket(), which takes a lockref reference via\nlockref_get_not_dead().\n\nOn PREEMPT_RT this may sleep, which is not allowed under the bucket\nbitlock, triggering \"sleeping function called from invalid context\".\n\nUse a no-ref bucket lookup in this path, then continue duplicate\nhandling without taking a lockref there.\n\nRefactor gfs2_qd_search_bucket() to build on top of the no-ref helper\nso lookup traversal stays in one place.\n\nThis patch fixes a bug reported by syzbot."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/gfs2/quota.c"], "versions": [{"version": "de0d95c26c41c1776e4d23b1a8b3f2bcfd1dae5f", "lessThan": "7fdcf16e5e14e11028f5bcaa6d25075eb5e876a0", "status": "affected", "versionType": "git"}, {"version": "de0d95c26c41c1776e4d23b1a8b3f2bcfd1dae5f", "lessThan": "812a766e2b0a8f4d094393fad13475c57f5f86db", "status": "affected", "versionType": "git"}, {"version": "de0d95c26c41c1776e4d23b1a8b3f2bcfd1dae5f", "lessThan": "b99a1f0f18ee50445907f55069e88bcfd8947383", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/gfs2/quota.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.11", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7fdcf16e5e14e11028f5bcaa6d25075eb5e876a0"}, {"url": "https://git.kernel.org/stable/c/812a766e2b0a8f4d094393fad13475c57f5f86db"}, {"url": "https://git.kernel.org/stable/c/b99a1f0f18ee50445907f55069e88bcfd8947383"}], "title": "gfs2: fix quota init duplicate scan", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/gfs2/quota.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7fdcf16e5e14e11028f5bcaa6d25075eb5e876a0", "status": "affected", "version": "de0d95c26c41c1776e4d23b1a8b3f2bcfd1dae5f", "versionType": "git"}, {"lessThan": "812a766e2b0a8f4d094393fad13475c57f5f86db", "status": "affected", "version": "de0d95c26c41c1776e4d23b1a8b3f2bcfd1dae5f", "versionType": "git"}, {"lessThan": "b99a1f0f18ee50445907f55069e88bcfd8947383", "status": "affected", "version": "de0d95c26c41c1776e4d23b1a8b3f2bcfd1dae5f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/gfs2/quota.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.11"}, {"lessThan": "6.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: fix quota init duplicate scan\n\ngfs2_quota_init() checks for duplicate quota_change IDs while holding\nqd_lock and the quota hash bucket bitlock. That path used\ngfs2_qd_search_bucket(), which takes a lockref reference via\nlockref_get_not_dead().\n\nOn PREEMPT_RT this may sleep, which is not allowed under the bucket\nbitlock, triggering \"sleeping function called from invalid context\".\n\nUse a no-ref bucket lookup in this path, then continue duplicate\nhandling without taking a lockref there.\n\nRefactor gfs2_qd_search_bucket() to build on top of the no-ref helper\nso lookup traversal stays in one place.\n\nThis patch fixes a bug reported by syzbot."}], "id": "CVE-2026-97521", "lastModified": "2026-09-28T06:16:38.160", "metrics": {}, "published": "2026-09-24T17:17:30.160", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7fdcf16e5e14e11028f5bcaa6d25075eb5e876a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/812a766e2b0a8f4d094393fad13475c57f5f86db"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b99a1f0f18ee50445907f55069e88bcfd8947383"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: gfs2: fix quota init duplicate scan", "id": "2540459", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2540459"}, "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-821", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ngfs2: fix quota init duplicate scan\ngfs2_quota_init() checks for duplicate quota_change IDs while holding\nqd_lock and the quota hash bucket bitlock. That path used\ngfs2_qd_search_bucket(), which takes a lockref reference via\nlockref_get_not_dead().\nOn PREEMPT_RT this may sleep, which is not allowed under the bucket\nbitlock, triggering \"sleeping function called from invalid context\".\nUse a no-ref bucket lookup in this path, then continue duplicate\nhandling without taking a lockref there.\nRefactor gfs2_qd_search_bucket() to build on top of the no-ref helper\nso lookup traversal stays in one place.\nThis patch fixes a bug reported by syzbot.", "A flaw was found in the Linux kernel's GFS2 (Global File System 2) file system, which can lead to a Denial of Service (DoS). In real-time kernel configurations, the quota initialization routine improperly invokes a sleeping function while holding an atomic lock. A local user capable of triggering GFS2 quota operations could exploit this behavior to cause a kernel crash and system unresponsiveness."], "name": "CVE-2026-97521", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "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"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97521\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97521\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97521.mbox"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7fdcf16e5e14e11028f5bcaa6d25075eb5e876a0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,812a766e2b0a8f4d094393fad13475c57f5f86db)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b99a1f0f18ee50445907f55069e88bcfd8947383)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.111)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.53)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T01:00:11.902729+00:00", "updated": "2026-10-01T12:00:06.851064+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}