CVE-2026-53043

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53043", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.380Z", "datePublished": "2026-06-24T16:29:49.480Z", "dateUpdated": "2026-08-05T12:32:50.728Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:50.728Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2/dlm: validate qr_numregions in dlm_match_regions()\n\nPatch series \"ocfs2/dlm: fix two bugs in dlm_match_regions()\".\n\nIn dlm_match_regions(), the qr_numregions field from a DLM_QUERY_REGION\nnetwork message is used to drive loops over the qr_regions buffer without\nsufficient validation. This series fixes two issues:\n\n- Patch 1 adds a bounds check to reject messages where qr_numregions\n exceeds O2NM_MAX_REGIONS. The o2net layer only validates message\n byte length; it does not constrain field values, so a crafted message\n can set qr_numregions up to 255 and trigger out-of-bounds reads past\n the 1024-byte qr_regions buffer.\n\n- Patch 2 fixes an off-by-one in the local-vs-remote comparison loop,\n which uses '<=' instead of '<', reading one entry past the valid range\n even when qr_numregions is within bounds.\n\n\nThis patch (of 2):\n\nThe qr_numregions field from a DLM_QUERY_REGION network message is used\ndirectly as loop bounds in dlm_match_regions() without checking against\nO2NM_MAX_REGIONS. Since qr_regions is sized for at most O2NM_MAX_REGIONS\n(32) entries, a crafted message with qr_numregions > 32 causes\nout-of-bounds reads past the qr_regions buffer.\n\nAdd a bounds check for qr_numregions before entering the loops."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable `DLM_QUERY_REGION` message is received over OCFS2 o2net TCP connections from cluster peers, so the code is reachable via network protocol traffic.\nAC:L - A malicious configured/heartbeating peer can create the DLM join state and send a crafted `qr_numregions` value; no race or condition outside the attacker's control is required once the cluster service is exposed.\nPR:N - The receiver performs cluster IP/heartbeat gating but no user authentication or target-local privilege check before dispatching the DLM message, so exploitation does not require an account or privileges on the victim.\nUI:N - No victim user action is needed after the OCFS2 cluster/DLM service is running; the attacker sends network messages.\nS:U - The impact remains within the kernel/OCFS2 cluster node security authority and does not cross a separate boundary such as guest-to-host or IOMMU isolation.\nC:H - The attacker-controlled count drives out-of-bounds reads past the fixed `qr_regions` buffer into adjacent kernel memory; under the higher-severity rule, this is a high confidentiality impact.\nI:N - The vulnerable loops perform reads and comparisons/logging only, with no out-of-bounds write or demonstrated control-flow/data modification primitive.\nA:H - The crafted message can force kernel out-of-bounds memory reads from the receive buffer path and can reasonably cause an oops/crash or repeated DLM join failure, so availability impact is high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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{}

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This series fixes two issues:\n\n- Patch 1 adds a bounds check to reject messages where qr_numregions\n exceeds O2NM_MAX_REGIONS. The o2net layer only validates message\n byte length; it does not constrain field values, so a crafted message\n can set qr_numregions up to 255 and trigger out-of-bounds reads past\n the 1024-byte qr_regions buffer.\n\n- Patch 2 fixes an off-by-one in the local-vs-remote comparison loop,\n which uses '<=' instead of '<', reading one entry past the valid range\n even when qr_numregions is within bounds.\n\n\nThis patch (of 2):\n\nThe qr_numregions field from a DLM_QUERY_REGION network message is used\ndirectly as loop bounds in dlm_match_regions() without checking against\nO2NM_MAX_REGIONS. Since qr_regions is sized for at most O2NM_MAX_REGIONS\n(32) entries, a crafted message with qr_numregions > 32 causes\nout-of-bounds reads past the qr_regions buffer.\n\nAdd a bounds check for qr_numregions before entering the loops."}], "id": "CVE-2026-53043", "lastModified": "2026-07-14T19:27:29.090", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-06-24T17:17:16.063", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f8b91275912cd428289c1fb424bebd7ff5302bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3f474c33ebc2e2ca3fcb587d7de4375348f13373"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c6e8fc3c007319981647b410c29bb5775048551"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ab3fbb01bc6d79091bc375e5235d360cd9b78be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3d5efade0c79dac1cac98c0cb1115432f804439"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f37de46149db49abd2b24f4f0c5a88cf4dfb5f47"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f69551139caf6d24242a0ad049ee46b264e3aee0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ocfs2/dlm: validate qr_numregions in dlm_match_regions()", "id": "2492405", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492405"}, "csaw": false, "cwe": "CWE-1285", "details": ["A flaw was found in the Linux kernel's Oracle Cluster File System 2 (OCFS2) Distributed Lock Manager (DLM). A remote attacker could exploit this vulnerability by sending a specially crafted network message. Insufficient validation of the qr_numregions field in the dlm_match_regions() function allows for out-of-bounds reads past a buffer, which could lead to information disclosure or a denial of service."], "name": "CVE-2026-53043", "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": "Not affected", "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-2026-53043\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53043\nhttps://lore.kernel.org/linux-cve-announce/2026062457-CVE-2026-53043-5980@gregkh/T"]}

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