CVE-2026-93086

/// Technical description

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

firmware: arm_scmi: Avoid IDR updates while cleaning channels

scmi_cleanup_channels() walks the TX/RX channel IDRs with

idr_for_each() to free transport resources and destroy the dedicated

transport devices before calling idr_destroy().

The destroy callback removed each entry from the same IDR being walked.

That is not needed for this cleanup path, and it is unsafe because

idr_for_each() has not advanced its radix-tree iterator while the

callback is running. Removing the current entry from the callback can

invalidate the iterator state. The callback also cannot be protected by

rcu_read_lock(), because scmi_device_destroy() may sleep.

Leave IDR teardown to the following idr_destroy() call and keep the

callback limited to device destruction.

/// 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