Linux kernel amdgpu power management (SMU/powerplay) (drm/amd/pm): A use-after-free in the amdgpu power management

Impact

A use-after-free in the amdgpu power management (SMU/powerplay). Freed kernel memory is reachable again through a later operation, so an attacker who can win the timing and reoccupy the freed slab object gets a write (or a controlled read) into live kernel memory. In practice this is a local-privilege-escalation primitive: from inside a GPU container it is a route to host kernel code execution, and from there to every other tenant's GPU memory and data on the node. Unexploited, it is a kernel panic that takes the whole node down mid-job. Upstream fix: drm/amd/pm: fix double free in si_parse_power_table()

Who can reach it

Local. Reachable by a local user with root or with write access to the amdgpu sysfs/debugfs power interfaces; on most clusters that means a compromised node agent or a privileged DaemonSet, not a plain tenant pod. Not reachable over the network and not reachable from a container that has no GPU device node mapped in.

What to do

Kernel-side fix: this lands in mainline Linux and flows into distro kernels (RHEL/Rocky, Ubuntu HWE, SLES) and into AMD's out-of-tree DKMS amdgpu package shipped with ROCm. Patch the kernel or the DKMS module, then **reload the amdgpu module or reboot the node** - you cannot fix a running driver in place. Reloading amdgpu requires no process holding /dev/kfd or a render node, so in practice this is a cordon + drain + reboot per node. Plan it as a rolling maintenance across the fleet; there is no VBIOS flash, no SBIOS/AGESA step and no firmware update involved. Nodes running the ROCm DKMS stack often lag mainline by a release or two, so confirm the fix is actually present in the AMD driver version you deploy rather than assuming a new distro kernel covers it.

References