CVE-2024-46689

2024-09-1306:15:13

Linux

web.nvd.nist.gov

linux kernel

vulnerability

soc: qcom

cmd-db

memory mapping

security

xen

kvm

qualcomm

hypervisor

AI Score

6.5

Confidence

Low

EPSS

Percentile

10.9%

JSON

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.

Affected configurations

Vulners

Node

linuxlinux_kernelRange4.18–5.4.283

linuxlinux_kernelRange5.5.0–5.10.225

linuxlinux_kernelRange5.11.0–5.15.166

linuxlinux_kernelRange5.16.0–6.1.108

linuxlinux_kernelRange6.2.0–6.6.49

linuxlinux_kernelRange6.7.0–6.10.8

linuxlinux_kernelRange6.11.0≥

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/soc/qcom/cmd-db.c"
    ],
    "versions": [
      {
        "version": "312416d9171a",
        "lessThan": "0ee9594c9743",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "312416d9171a",
        "lessThan": "f5a5a5a0e95f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "312416d9171a",
        "lessThan": "eaff392c1e34",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "312416d9171a",
        "lessThan": "d9d48d70e922",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "312416d9171a",
        "lessThan": "ef80520be0ff",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "312416d9171a",
        "lessThan": "62c2d63605ca",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "312416d9171a",
        "lessThan": "f9bb896eab22",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/soc/qcom/cmd-db.c"
    ],
    "versions": [
      {
        "version": "4.18",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.18",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.283",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.225",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.166",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.108",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.49",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10.8",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]