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Esta regi\u00f3n de memoria est\u00e1 protegida contra escritura por XPU. En ocasiones, XPU puede detectar err\u00f3neamente la expulsi\u00f3n de cach\u00e9 limpia como \"escritura\" en la regi\u00f3n protegida contra escritura, lo que genera una interrupci\u00f3n segura que provoca un bucle sin fin en alg\u00fan lugar de la Zona de confianza. La \u00fanica raz\u00f3n por la que funciona en este momento es porque Qualcomm Hypervisor asigna la misma regi\u00f3n que la memoria no almacenable en cach\u00e9 en las tablas de traducci\u00f3n de la Etapa 2. El problema se manifiesta si queremos usar otro hipervisor (como Xen o KVM), que no sabe nada sobre esas asignaciones espec\u00edficas. Cambiar la asignaci\u00f3n de memoria cmd-db de MEMREMAP_WB a MEMREMAP_WT/WC elimina la dependencia de las asignaciones correctas en las tablas de la Etapa 2. Este parche corrige el problema actualizando la asignaci\u00f3n a MEMREMAP_WC. Prob\u00e9 esto en SA8155P con Xen."}], "id": "CVE-2024-46689", "lastModified": "2024-09-20T15:52:23.727", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "[email protected]", "type": "Primary"}]}, "published": "2024-09-13T06:15:13.653", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0ee9594c974368a17e85a431e9fe1c14fb65c278"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/62c2d63605ca25b5db78a347ed303c0a0a77d5b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d9d48d70e922b272875cda60d2ada89291c840cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eaff392c1e34fb77cc61505a31b0191e5e46e271"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ef80520be0ff78ae5ed44cb6eee1525e65bebe70"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f5a5a5a0e95f36e2792d48e6e4b64e665eb01374"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9bb896eab221618927ae6a2f1d566567999839d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: soc: qcom: cmd-db: Map shared memory as WC, not WB", "id": "2312077", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2312077"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-665", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsoc: qcom: cmd-db: Map shared memory as WC, not WB\nLinux does not write into cmd-db region. This region of memory is write\nprotected by XPU. XPU may sometime falsely detect clean cache eviction\nas \"write\" into the write protected region leading to secure interrupt\nwhich causes an endless loop somewhere in Trust Zone.\nThe only reason it is working right now is because Qualcomm Hypervisor\nmaps the same region as Non-Cacheable memory in Stage 2 translation\ntables. The issue manifests if we want to use another hypervisor (like\nXen or KVM), which does not know anything about those specific mappings.\nChanging the mapping of cmd-db memory from MEMREMAP_WB to MEMREMAP_WT/WC\nremoves dependency on correct mappings in Stage 2 tables. This patch\nfixes the issue by updating the mapping to MEMREMAP_WC.\nI tested this on SA8155P with Xen."], "name": "CVE-2024-46689", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "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"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46689\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46689\nhttps://lore.kernel.org/linux-cve-announce/2024091339-CVE-2024-46689-4c19@gregkh/T"], "threat_severity": "Moderate"}