CVE-2026-74334

Summary

In the Linux kernel, the following vulnerability has been resolved:

RDMA/nldev: Fix locking when accessing mr->pd

Sashiko points out that, due to rereg_mr, the PD is actually variable and all the touches in nldev are racy.

Use mr->device instead of mr->pd->device.

Getting the PD restrack ID is more tricky. To avoid disturbing all the happy paths, add an rdma_restrack_sync() operation which is sort of like flush_workqueue() or synchronize_irq(): after it returns, all the old nldev touches to the mr are gone and everything sees the new PD. This makes it safe to reach into the PD pointer.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxda5c8507821573b8ed6e3f47e009f273493ffaf7 < 1a132ee4e655288d9a0937ea5109a0d038431ae9affected
LinuxLinuxda5c8507821573b8ed6e3f47e009f273493ffaf7 < 50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3affected
LinuxLinux4.18affected
LinuxLinux0 < 4.18unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References