IT

Tracker / CVE-2024-46689

CVE-2024-46689

Medium 5.5

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 products and versions

linux linux_kernel
linux linux_kernel · 4.18 → 5.4.283
linux linux_kernel · 5.11 → 5.15.166
linux linux_kernel · 5.16 → 6.1.108
linux linux_kernel · 5.5 → 5.10.225
linux linux_kernel · 6.2 → 6.6.49
linux linux_kernel · 6.7 → 6.10.8

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References