CVE-2026-90270
Description
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.
How to fix
- Linux Linux7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2, bb1a0f582d519c0461b0940116e2b52c5ba31459 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | f04046f2577a5c76167333ca99d3903ee5331ba0 ≤ v < 7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2, f04046f2577a5c76167333ca99d3903ee5331ba0 ≤ v < bb1a0f582d519c0461b0940116e2b52c5ba31459, 6.19 | 7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2, bb1a0f582d519c0461b0940116e2b52c5ba31459 |
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