CVE-2026-93086
UnknownSummary
In the Linux kernel's ARM SCMI subsystem, a vulnerability exists where during channel cleanup, the callback that removes entries from the IDR while iterating with idr_for_each() can invalidate the iterator, leading to unsafe behavior. Additionally, the callback cannot be protected by rcu_read_lock() because it may sleep.
Risk Assessment
The vulnerability could lead to system crashes or unpredictable behavior during channel cleanup, potentially enabling a DoS attack.
Recommendation
Apply the patch that leaves IDR teardown to idr_destroy() and limits the callback to device destruction. Update the kernel to a version containing this fix.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS