pds_core: fix use-after-free on workqueue during remove

Summary

In the Linux kernel, the following vulnerability has been resolved: pds_core: fix use-after-free on workqueue during remove In pdsc_remove(), the workqueue is destroyed before pdsc_teardown() is called. This ordering allows two paths to queue work on the destroyed workqueue: 1. If pdsc_teardown() -> pdsc_devcmd_reset() times out, the error path in pdsc_devcmd_locked() queues health_work. 2. A NotifyQ event can trigger the ISR and queue work before free_irq() is called in pdsc_teardown(). Fix by moving destroy_workqueue() after pdsc_teardown() so the workqueue outlives every queuer; destroy_workqueue() then flushes any work still pending. Draining the queued work also requires ordering the teardown so the resources that work touches are freed last: • In pdsc_qcq_free(), after freeing the interrupt, cancel_work_sync() the queue's work and only then clear qcq->intx, so pdsc_process_adminq()'s read of qcq->intx for interrupt-credit return cannot race with the clear. • Free adminqcq before notifyqcq: the shared adminq ISR is released when adminqcq is freed, and the adminq work accesses notifyqcq, so both must be stopped before notifyqcq is freed.

Timeline

1. Aug 10, 2026, 12:02 PM UTCCVE published
2. Oct 21, 2026, 12:43 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 01ba61b55b2041a39c54aefb3153c770dd59a0ef · fixed in bac237c2aedb8225bfd2317c1361bbfce1e419ca; From 01ba61b55b2041a39c54aefb3153c770dd59a0ef · fixed in 224214eb4182ff20a665b615a90b66017539dd75; From 01ba61b55b2041a39c54aefb3153c770dd59a0ef · fixed in 9e0f80fac50ab95dd75537c8ecaf5051d01f19b5; From 01ba61b55b2041a39c54aefb3153c770dd59a0ef · fixed in ecc7a7d7569ec1d6a61e18372696b9de97635156; From 01ba61b55b2041a39c54aefb3153c770dd59a0ef · fixed in 0ad134881508c36b65c1a8864f8bec53adbd3327

• Linux Linux

  6.4

• KernelLinux

  From 6.4.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6

References 5