{"cve":{"cve_id":"CVE-2026-53043","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":null,"epss_percentile":null,"epss_as_of":null,"description":"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.","published_at":"2026-06-24T16:29:49.480000Z","last_modified_at":null,"cvss_v3_score":9.1,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/d3d5efade0c79dac1cac98c0cb1115432f804439","https://git.kernel.org/stable/c/f69551139caf6d24242a0ad049ee46b264e3aee0","https://git.kernel.org/stable/c/1f8b91275912cd428289c1fb424bebd7ff5302bd","https://git.kernel.org/stable/c/f37de46149db49abd2b24f4f0c5a88cf4dfb5f47","https://git.kernel.org/stable/c/6c6e8fc3c007319981647b410c29bb5775048551","https://git.kernel.org/stable/c/3f474c33ebc2e2ca3fcb587d7de4375348f13373","https://git.kernel.org/stable/c/3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21","https://git.kernel.org/stable/c/7ab3fbb01bc6d79091bc375e5235d360cd9b78be"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-28T17:55:28.590503Z","updated_at":"2026-06-28T23:30:49.890169Z"},"effective_severity":"CRITICAL","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ea2034416b54700e30371f2ad6517cbb94674083","version_start_inclusive":true,"version_end":"d3d5efade0c79dac1cac98c0cb1115432f804439","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ea2034416b54700e30371f2ad6517cbb94674083:d3d5efade0c79dac1cac98c0cb1115432f804439"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ea2034416b54700e30371f2ad6517cbb94674083","version_start_inclusive":true,"version_end":"f69551139caf6d24242a0ad049ee46b264e3aee0","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ea2034416b54700e30371f2ad6517cbb94674083:f69551139caf6d24242a0ad049ee46b264e3aee0"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ea2034416b54700e30371f2ad6517cbb94674083","version_start_inclusive":true,"version_end":"1f8b91275912cd428289c1fb424bebd7ff5302bd","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ea2034416b54700e30371f2ad6517cbb94674083:1f8b91275912cd428289c1fb424bebd7ff5302bd"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ea2034416b54700e30371f2ad6517cbb94674083","version_start_inclusive":true,"version_end":"f37de46149db49abd2b24f4f0c5a88cf4dfb5f47","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ea2034416b54700e30371f2ad6517cbb94674083:f37de46149db49abd2b24f4f0c5a88cf4dfb5f47"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ea2034416b54700e30371f2ad6517cbb94674083","version_start_inclusive":true,"version_end":"6c6e8fc3c007319981647b410c29bb5775048551","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ea2034416b54700e30371f2ad6517cbb94674083:6c6e8fc3c007319981647b410c29bb5775048551"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ea2034416b54700e30371f2ad6517cbb94674083","version_start_inclusive":true,"version_end":"3f474c33ebc2e2ca3fcb587d7de4375348f13373","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ea2034416b54700e30371f2ad6517cbb94674083:3f474c33ebc2e2ca3fcb587d7de4375348f13373"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ea2034416b54700e30371f2ad6517cbb94674083","version_start_inclusive":true,"version_end":"3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ea2034416b54700e30371f2ad6517cbb94674083:3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ea2034416b54700e30371f2ad6517cbb94674083","version_start_inclusive":true,"version_end":"7ab3fbb01bc6d79091bc375e5235d360cd9b78be","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ea2034416b54700e30371f2ad6517cbb94674083:7ab3fbb01bc6d79091bc375e5235d360cd9b78be"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"2.6.37","version_start_inclusive":true,"version_end":"2.6.37","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:2.6.37:2.6.37"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"2.6.37","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:2.6.37"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.10.258","version_start_inclusive":true,"version_end":"5.10.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.10.258:5.10.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.15.209","version_start_inclusive":true,"version_end":"5.15.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.15.209:5.15.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.1.175","version_start_inclusive":true,"version_end":"6.1.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.1.175:6.1.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.6.141","version_start_inclusive":true,"version_end":"6.6.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.6.141:6.6.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.12.91","version_start_inclusive":true,"version_end":"6.12.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.12.91:6.12.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.18.33","version_start_inclusive":true,"version_end":"6.18.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.18.33:6.18.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.0.10","version_start_inclusive":true,"version_end":"7.0.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.0.10:7.0.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.1","version_start_inclusive":true,"version_end":"*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.1:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://git.kernel.org/stable/c/d3d5efade0c79dac1cac98c0cb1115432f804439","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/f69551139caf6d24242a0ad049ee46b264e3aee0","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/1f8b91275912cd428289c1fb424bebd7ff5302bd","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/f37de46149db49abd2b24f4f0c5a88cf4dfb5f47","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/6c6e8fc3c007319981647b410c29bb5775048551","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/3f474c33ebc2e2ca3fcb587d7de4375348f13373","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/7ab3fbb01bc6d79091bc375e5235d360cd9b78be","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-24T16:29:49.480000Z","label":"CVE published","source":null}]}