CVE-2021-47160

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an attacker must be on the same L2 segment (wired LAN or guest Wi\u2011Fi bridged onto a DSA port), which is Adjacent, not remote Internet.\nAC:L - After the common multi-bridge vlan_filtering enable-then-disable sequence leaves PCR_MATRIX as ALL_MEMBERS in PORT_MATRIX_MODE, forwarding between the wrongly linked ports is deterministic\u2014the attacker only needs to send or receive ordinary Ethernet frames with no race or uncontrollable hardware state.\nPR:N - Exploitation is by an unauthenticated adjacent host on a switch port or bridged WLAN; no local account or capability on the device is required to sniff or inject across the broken bridge isolation.\nUI:N - No victim action is required; once the switch is in the vulnerable matrix state, the attacker\u2019s own traffic is forwarded across the isolation boundary automatically.\nS:U - Impact stays within the same kernel/switch forwarding authority (cross-bridge L2 leak on one host); it is not a VM/IOMMU/sandbox escape into a different security authority.\nC:H - With PCR_MATRIX stuck at ALL_MEMBERS, frames from other intended-isolated bridges/VLANs are delivered to the attacker\u2019s port, exposing full confidentiality of traffic on those segments.\nI:H - The same all-members matrix lets the attacker inject arbitrary frames into other bridges\u2019 ports, fully compromising integrity of those isolated network segments.\nA:N - The defect is a pure forwarding/isolation failure with no kernel oops, hang, or resource exhaustion in the fixed path; 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Como port_bridge_{add,del} ha configurado PCR_MATRIX correctamente, elimine la escritura PCR_MATRIX de mt7530_port_set_vlan_aware."}], "id": "CVE-2021-47160", "lastModified": "2026-08-04T10:16:49.620", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47160", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-03-25T13:55:35.659497Z", "version": "2.0.3"}}]}, "published": "2024-03-25T10:15:08.377", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/474a2ddaa192777522a7499784f1d60691cd831a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/82ae35b6c14feae5f216913d5b433e143c756d4e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ae389812733b1b1e8e07fcc238e41db166b5c78d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b91117b66fe875723a4e79ec6263526fffdb44d2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/474a2ddaa192777522a7499784f1d60691cd831a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/82ae35b6c14feae5f216913d5b433e143c756d4e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ae389812733b1b1e8e07fcc238e41db166b5c78d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b91117b66fe875723a4e79ec6263526fffdb44d2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: dsa: mt7530: fix VLAN traffic leaks", "id": "2271472", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2271472"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-402", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: dsa: mt7530: fix VLAN traffic leaks\nPCR_MATRIX field was set to all 1's when VLAN filtering is enabled, but\nwas not reset when it is disabled, which may cause traffic leaks:\nip link add br0 type bridge vlan_filtering 1\nip link add br1 type bridge vlan_filtering 1\nip link set swp0 master br0\nip link set swp1 master br1\nip link set br0 type bridge vlan_filtering 0\nip link set br1 type bridge vlan_filtering 0\n# traffic in br0 and br1 will start leaking to each other\nAs port_bridge_{add,del} have set up PCR_MATRIX properly, remove the\nPCR_MATRIX write from mt7530_port_set_vlan_aware."], "name": "CVE-2021-47160", "package_state": [{"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": "2024-03-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47160\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47160\nhttps://lore.kernel.org/linux-cve-announce/2024032534-CVE-2021-47160-8e53@gregkh/T"], "threat_severity": "Low"}

{}