CVE-2026-43115

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> srcu: Use irq_work to start GP in tiny SRCU<br /> <br /> Tiny SRCU&amp;#39;s srcu_gp_start_if_needed() directly calls schedule_work(),<br /> which acquires the workqueue pool-&gt;lock.<br /> <br /> This causes a lockdep splat when call_srcu() is called with a scheduler<br /> lock held, due to:<br /> <br /> call_srcu() [holding pi_lock]<br /> srcu_gp_start_if_needed()<br /> schedule_work() -&gt; pool-&gt;lock<br /> <br /> workqueue_init() / create_worker() [holding pool-&gt;lock]<br /> wake_up_process() -&gt; try_to_wake_up() -&gt; pi_lock<br /> <br /> Also add irq_work_sync() to cleanup_srcu_struct() to prevent a<br /> use-after-free if a queued irq_work fires after cleanup begins.<br /> <br /> Tested with rcutorture SRCU-T and no lockdep warnings.<br /> <br /> [ Thanks to Boqun for similar fix in patch "rcu: Use an intermediate irq_work<br /> to start process_srcu()" ]