habanalabs kernel driver (MMU shadow teardown): A memory leak on the habanalabs MMU teardown path

Impact

A memory leak on the habanalabs MMU teardown path. Each affected teardown leaks host-resident shadow page-table memory, so a tenant that repeatedly opens and closes the device can grind the node into OOM over a long-running shift. Slow-burn availability problem, not a confidentiality one.

Who can reach it

Local user with the habanalabs device node - repeated device open/close cycles are enough.

What to do

Fix ships in the Linux kernel. Update the kernel and reboot the node - in practice this is a drain plus reboot because the accelerator driver cannot be unloaded while jobs hold device file descriptors. No BIOS or firmware update needed.

References