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An attacker can leverage the shared branch history in the Branch History Buffer (BHB) to influence mispredicted branches. Then, cache allocation can allow the attacker to obtain sensitive information."}, {"lang": "es", "value": "Algunos procesadores Arm Cortex y Neoverse versiones hasta 08-03-2022 no restringen apropiadamente la especulaci\u00f3n de la cach\u00e9, tambi\u00e9n conocida como Spectre-BHB. Un atacante puede aprovechar el historial de bifurcaciones compartido en el Buffer del Historial de Bifurcaciones (BHB) para influir en las bifurcaciones predichas inapropiadamente. Entonces, la asignaci\u00f3n de la cach\u00e9 puede permitir al atacante obtener informaci\u00f3n confidencial"}], "id": "CVE-2022-23960", "lastModified": "2023-01-20T02:34:50.987", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 1.9, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:L/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 3.4, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.1, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2022-03-13T00:15:07.990", "references": [{"source": "cve@mitre.org", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2022/03/18/2"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://developer.arm.com/support/arm-security-updates"}, {"source": "cve@mitre.org", "tags": ["Mitigation", "Patch", "Vendor Advisory"], "url": "https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability"}, {"source": "cve@mitre.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2022/dsa-5173"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2022:7683", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-425.3.1.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-11-08T00:00:00Z"}, {"advisory": "RHSA-2024:0930", "cpe": "cpe:/o:redhat:rhel_eus:8.6", "package": "kernel-0:4.18.0-372.93.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Extended Update Support", "release_date": "2024-02-21T00:00:00Z"}, {"advisory": "RHSA-2024:0930", "cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8", "package": "kernel-0:4.18.0-372.93.1.el8_6", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8", "release_date": "2024-02-21T00:00:00Z"}], "bugzilla": {"description": "hw: cpu: arm64: Spectre-BHB", "id": "2062284", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2062284"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N", "status": "verified"}, "details": ["Certain Arm Cortex and Neoverse processors through 2022-03-08 do not properly restrict cache speculation, aka Spectre-BHB. An attacker can leverage the shared branch history in the Branch History Buffer (BHB) to influence mispredicted branches. Then, cache allocation can allow the attacker to obtain sensitive information.", "A new cache speculation vulnerability, known as Branch History Injection (BHI) or Spectre-BHB, was found in hw. Spectre-BHB is similar to Spectre v2, except that malicious code uses the shared branch history (stored in the CPU Branch History Buffer, or BHB) to influence mispredicted branches within the victim's hardware context. Once that occurs, speculation caused by the mispredicted branches can cause cache allocation. This issue leads to obtaining information that should not be accessible."], "mitigation": {"lang": "en:us", "value": "Disabling unprivileged eBPF effectively mitigates the known attack vectors for exploiting intra-mode branch injections attacks.\nThe default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl.\nFor the Red Hat Enterprise Linux 7, the eBPF for unprivileged users is always disabled.\nFor the Red Hat Enterprise Linux 8 to confirm the current state, inspect the sysctl with the command:\n# cat /proc/sys/kernel/unprivileged_bpf_disabled\nThe setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw."}, "name": "CVE-2022-23960", "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2022-03-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-23960\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-23960\nhttps://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/spectre-bhb"], "statement": "The current known mechanisms to exploit this issue rely on unprivileged eBPF functionality. Unprivileged eBPF is disabled by default on Red Hat Enterprise Linux.", "threat_severity": "Moderate"}