FKIE_CVE-2024-46689

Vulnerability from fkie_nvd - Published: 2024-09-13 06:15 - Updated: 2025-11-03 23:15
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: soc: qcom: cmd-db: Map shared memory as WC, not WB Linux does not write into cmd-db region. This region of memory is write protected by XPU. XPU may sometime falsely detect clean cache eviction as "write" into the write protected region leading to secure interrupt which causes an endless loop somewhere in Trust Zone. The only reason it is working right now is because Qualcomm Hypervisor maps the same region as Non-Cacheable memory in Stage 2 translation tables. The issue manifests if we want to use another hypervisor (like Xen or KVM), which does not know anything about those specific mappings. Changing the mapping of cmd-db memory from MEMREMAP_WB to MEMREMAP_WT/WC removes dependency on correct mappings in Stage 2 tables. This patch fixes the issue by updating the mapping to MEMREMAP_WC. I tested this on SA8155P with Xen.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0ee9594c974368a17e85a431e9fe1c14fb65c278Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/62c2d63605ca25b5db78a347ed303c0a0a77d5b4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d9d48d70e922b272875cda60d2ada89291c840cfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eaff392c1e34fb77cc61505a31b0191e5e46e271Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef80520be0ff78ae5ed44cb6eee1525e65bebe70Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f5a5a5a0e95f36e2792d48e6e4b64e665eb01374Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9bb896eab221618927ae6a2f1d566567999839dPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsoc: qcom: cmd-db: Map shared memory as WC, not WB\n\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.\n\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.\n\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.\n\nI tested this on SA8155P with Xen."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: soc: qcom: cmd-db: Asignar memoria compartida como WC, no como WB Linux no escribe en la regi\u00f3n cmd-db. 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."
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  "id": "CVE-2024-46689",
  "lastModified": "2025-11-03T23:15:53.753",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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  "published": "2024-09-13T06:15:13.653",
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  "vulnStatus": "Modified",
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