In the Linux kernel, the following vulnerability has been resolved: char: xillybus: Don't destroy workqueue from work item running on it Triggered by a kref decrement, destroy_workqueue() may be called from within a work item for destroying its own workqueue. This illegal situation is averted by adding a module-global workqueue for exclusive use of the offending work item. Other work items continue to be queued on per-device workqueues to ensure performance.
https://git.kernel.org/stable/c/ccbde4b128ef9c73d14d0d7817d68ef795f6d131
https://git.kernel.org/stable/c/aa1a19724fa2c31e97a9be48baedd4692b265157
https://git.kernel.org/stable/c/a7ad105b12256ec7fb6d6d1a0e2e60f00b7da157
https://git.kernel.org/stable/c/5d3567caff2a1d678aa40cc74a54e1318941fad3
https://git.kernel.org/stable/c/409b495f8e3300d5fba08bc817fa8825dae48cc9