{"cve":{"cve_id":"CVE-2021-3444","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":0.0061,"epss_percentile":0.44524,"epss_as_of":"2026-06-23","description":"The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 (\"bpf: Fix truncation handling for mod32 dst reg wrt zero\") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.","published_at":"2021-03-23T17:45:13.714000Z","last_modified_at":null,"cvss_v3_score":7.8,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","cvss_v3_severity":"HIGH","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":["CWE-681"],"nvd_references":["https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b00f1b78809","https://www.openwall.com/lists/oss-security/2021/03/23/2","http://www.openwall.com/lists/oss-security/2021/03/23/2","http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html","https://security.netapp.com/advisory/ntap-20210416-0006/","https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html","http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html"],"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":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:15:46.345261Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"kernel","product_name":"Kernel","version_start":"trunk","version_start_inclusive":true,"version_end":"5.12-rc1","version_end_inclusive":false,"cpe23_uri":"cve5:linux:kernel:trunk:5.12-rc1"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"kernel","product_name":"Kernel","version_start":"5.11","version_start_inclusive":true,"version_end":"5.11.2","version_end_inclusive":false,"cpe23_uri":"cve5:linux:kernel:5.11:5.11.2"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"kernel","product_name":"Kernel","version_start":"5.10","version_start_inclusive":true,"version_end":"5.10.19","version_end_inclusive":false,"cpe23_uri":"cve5:linux:kernel:5.10:5.10.19"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"kernel","product_name":"Kernel","version_start":"5.4","version_start_inclusive":true,"version_end":"5.4.101","version_end_inclusive":false,"cpe23_uri":"cve5:linux:kernel:5.4:5.4.101"}],"exploit_refs":[],"news":[],"references":[{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b00f1b78809","source_type":"MISC","tags":["patch"]},{"url":"https://www.openwall.com/lists/oss-security/2021/03/23/2","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://www.openwall.com/lists/oss-security/2021/03/23/2","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html","source_type":"EXPLOIT","tags":["exploit","patch"]},{"url":"https://security.netapp.com/advisory/ntap-20210416-0006/","source_type":"MISC","tags":[]},{"url":"https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html","source_type":"EXPLOIT","tags":["exploit","patch"]}],"timeline":[{"type":"published","at":"2021-03-23T17:45:13.714000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:19:21.235572Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:19:21.235572Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:19:21.235572Z","label":"CVSS score revised","source":"cvelistv5"}]}