CVE-2022-49446

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

nvdimm: Fix firmware activation deadlock scenarios

Lockdep reports the following deadlock scenarios for CXL root device

power-management, device_prepare(), operations, and device_shutdown()

operations for 'nd_region' devices:

Chain exists of:

&nvdimm_region_key --> &nvdimm_bus->reconfig_mutex --> system_transition_mutex

Possible unsafe locking scenario:

CPU0 CPU1

---- ----

lock(system_transition_mutex);

lock(&nvdimm_bus->reconfig_mutex);

lock(system_transition_mutex);

lock(&nvdimm_region_key);

Chain exists of:

&cxl_nvdimm_bridge_key --> acpi_scan_lock --> &cxl_root_key

Possible unsafe locking scenario:

CPU0 CPU1

---- ----

lock(&cxl_root_key);

lock(acpi_scan_lock);

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References