CVE-2025-21983

CVE-2025-21983 describes a Linux kernel vulnerability where kvfree_rcu used the system_unbound_wq workqueue, potentially triggering a warning in nvme/scsi workflows due to flush_dependency checks. The mitigation documented in the sources is to switch kvfree_rcu to an independent WQ_MEM_RECLAIM wo...

CVE-2025-21983 mm/slab/kvfree_rcu: Switch to WQ_MEM_RECLAIM wq

In the Linux kernel, the following vulnerability has been resolved: mm/slab/kvfreercu: Switch to WQMEMRECLAIM wq Currently kvfreercu APIs use a system workqueue which is "systemunboundwq" to driver RCU machinery to reclaim a memory. Recently, it has been noted that the following kernel warning ca...