CVE-2021-3609

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This race condition in net/can/bcm.c in the Linux kernel allows for local privilege escalation to root."}, {"lang": "es", "value": "Se ha encontrado un fallo en el protocolo de red CAN BCM en el kernel de Linux, donde un atacante local puede abusar de un fallo en el subsistema CAN para corromper la memoria, bloquear el sistema o escalar privilegios. Esta condici\u00f3n de carrera en el archivo net/can/bcm.c en el kernel de Linux permite una escalada de privilegios local a root"}], "id": "CVE-2021-3609", "lastModified": "2026-06-17T04:05:26.027", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 6.9, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 3.4, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2022-03-03T19:15:08.173", "references": [{"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1971651"}, {"source": "secalert@redhat.com", "tags": ["Exploit", "Technical Description", "Third Party Advisory"], "url": "https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md"}, {"source": "secalert@redhat.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220419-0004/"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://www.openwall.com/lists/oss-security/2021/06/19/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1971651"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Technical Description", "Third Party Advisory"], "url": "https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220419-0004/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://www.openwall.com/lists/oss-security/2021/06/19/1"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Norbert Slusarek for reporting this issue.", "affected_release": [{"advisory": "RHSA-2021:3088", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-305.12.1.rt7.84.el8_4", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-08-10T00:00:00Z"}, {"advisory": "RHSA-2021:3044", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-08-10T00:00:00Z"}, {"advisory": "RHSA-2021:3057", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-305.12.1.el8_4", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-08-10T00:00:00Z"}, {"advisory": "RHSA-2021:3442", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-09-07T00:00:00Z"}, {"advisory": "RHSA-2021:3444", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "kernel-0:4.18.0-147.54.2.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-09-07T00:00:00Z"}, {"advisory": "RHSA-2021:3375", "cpe": "cpe:/a:redhat:rhel_eus:8.2::nfv", "package": "kernel-rt-0:4.18.0-193.64.1.rt13.115.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3363", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "kernel-0:4.18.0-193.64.1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3380", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-08-31T00:00:00Z"}, {"advisory": "RHSA-2021:3235", "cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8", "impact": "moderate", "package": "redhat-virtualization-host-0:4.4.7-20210804.0.el8_4", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8", "release_date": "2021-08-19T00:00:00Z"}], "bugzilla": {"description": "kernel: race condition in net/can/bcm.c leads to local privilege escalation", "id": "1971651", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1971651"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-362", "details": [".A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. This race condition in net/can/bcm.c in the Linux kernel allows for local privilege escalation to root.", "A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges."], "mitigation": {"lang": "en:us", "value": "As the CAN module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions:\n# echo \"install can-bcm /bin/true\" >> /etc/modprobe.d/disable-can-bcm.conf\nThe system will need to be restarted if the CAN modules are loaded. In most circumstances, the CAN kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use.\nIf the system requires this module to work correctly, this mitigation may not be suitable.\nIf you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services."}, "name": "CVE-2021-3609", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-06-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-3609\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-3609\nhttps://www.openwall.com/lists/oss-security/2021/06/19/1"], "statement": "Red Hat Product Security is aware of this issue. Updates will be released as they become available.\nFor Red Hat Virtualization, this flaw is rated Moderate as CAN is not used on host nodes.", "threat_severity": "Important"}

{}