arm_mpam: Disable driver unbind to avoid UAF

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In the Linux kernel, the following vulnerability has been resolved: arm_mpam: Disable driver unbind to avoid UAF When a user unbinds an MSC and that MSC is the only MSC left for a component then the corresponding mpam_component will be freed. If the user then goes on to read the schemata file in the resctrl filesystem then the mpam_component will be accessed from resctrl_arch_get_config() leading to a use after free. As the MPAM driver is not a module the unbind sysfs interface is the only way to trigger the remove. Instead of dealing with the complexity of allowing some unused MSC to unbind just remove the unbind sysfs interface.

Source published

17 Sep 2026 16:08:04 UTC

Source modified

19 Oct 2026 09:00:47 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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