IB/mlx4: Fix use-after-free on pkey sysfs registration failure

In the Linux kernel, the following vulnerability has been resolved: IB/mlx4: Fix use-after-free on pkey sysfs registration failure register_pkey_tree() ignores errors from register_one_pkey_tree() and continues registering the remaining slaves. The per-slave error path has already released the pkey parent kobjects, but their pointers remain stored in the device. A later device cleanup therefore passes the stale pointers to kobject_put(), causing a use-after-free. Clear the parent pointers after releasing a failed slave tree and skip unregistered trees during device cleanup. This preserves the existing best-effort registration behavior while preventing a second cleanup of the failed tree.

Source published

6 Oct 2026 08:44:53 UTC

Source modified

19 Oct 2026 09:15:47 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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