CVE-2025-21850

CVE-2025-21850 concerns the Linux kernel nvmet subsystem where a crash can occur when disabling a namespace while a percpu counter tracks pending I/O. The root cause is unsafe handling of the percpu counter during enable/disable cycles, which could lead to a crash (as observed in blktests/nvme/05...

CVE-2025-21850 nvmet: Fix crash when a namespace is disabled

In the Linux kernel, the following vulnerability has been resolved: nvmet: Fix crash when a namespace is disabled The namespace percpu counter protects pending I/O, and we can only safely diable the namespace once the counter drop to zero. Otherwise we end up with a crash when running...