CVE-2026-90270
N/A
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | f04046f2577a5c76167333ca99d3903ee5331ba0 < 7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2 | affected |
| Linux | Linux | f04046f2577a5c76167333ca99d3903ee5331ba0 < bb1a0f582d519c0461b0940116e2b52c5ba31459 | affected |
| Linux | Linux | 6.19 | affected |
| Linux | Linux | 0 < 6.19 | unaffected |
| Linux | Linux | 7.2.6 <= 7.2.* | unaffected |
| Linux | Linux | 7.3-rc1 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2
- https://git.kernel.org/stable/c/bb1a0f582d519c0461b0940116e2b52c5ba31459
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.