CVE-2026-93086

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.

• https://git.kernel.org/stable/c/431c6b872ba7fedcc5a3afb0ec3517db4d95d088
• https://git.kernel.org/stable/c/54e5a4f7d83db4552d963d0785be32d9df680dcd
• https://git.kernel.org/stable/c/aed24a3c63920539e9de7fbfe7929a2e7c888cd2
• https://git.kernel.org/stable/c/bab26acebe55e8ad3ab545abda72faa7ca28c477
• https://git.kernel.org/stable/c/c38b1e19485aaa820e52cfe162525a8af67563da
• https://git.kernel.org/stable/c/f50698c617350a6e2064dffd6cff3f391e142f55