CVE-2026-97925
UnknownSummary
A race condition in the Linux kernel during broadcast device replacement can lead to using a detached device, potentially triggering a BUG() in tick_cleanup_dead_cpu() when the last CPU in a restricted interrupt affinity mask goes offline.
Risk Assessment
The risk includes system crash (kernel panic) when a CPU with restricted interrupt affinity is removed, potentially causing service unavailability and downtime.
Recommendation
Apply the vendor patch that serializes tick_install_broadcast_device() with tick_broadcast_lock and splits clockevents_exchange_device() into two steps. Update the kernel to a patched version.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tick/broadcast: Plug clockevents replacement race 朱恺乾 reported and decoded the following race condition when a broadcast device is replaced: CPUA CPUB __tick_broadcast_oneshot_control() bc = tick_broadcast_device.evtdev; tick_install_broadcast_device(dev) clockevents_exchange_device(cur, dev) shutdown(cur); detach(cur); cur->handler = noop; tick_broadcast_device.evtdev = dev; tick_broadcast_set_event(bc, next_event); <- FAIL: arms a detached device. If the original broadcast device has a restricted interrupt affinity mask and the last CPU in that mask goes offline then the BUG() in tick_cleanup_dead_cpu() triggers because the clockevent device is not in detached state. The reason for this is that tick_install_broadcast_device() is not serialized vs. tick broadcast operations. The obvious cure is to serialize tick_install_broadcast_device() with tick_broadcast_lock against a concurrent tick broadcast operation. That requires to split clockevents_exchange_device() into two parts, one which does the exchange, shutdown and detach operation and the other which drops the module reference count. This is required because the module reference cannot be dropped while holding tick_broadcast_lock. Let clockevents_exchange_device() do both operations as before, but let the broadcast device code take the two step approach and do the device exchange under tick_broadcast_lock and drop the module reference count after releasing it.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS