CVE-2025-40336: drm/gpusvm: fix hmm_pfn_to_map_order() usage
In the Linux kernel, the following vulnerability has been resolved:
drm/gpusvm: fix hmmpfntomaporder() usage
Handle the case where the hmm range partially covers a huge page (like 2M), otherwise we can potentially end up doing something nasty like mapping memory which is outside the range, and maybe not even mapped by the mm. Fix is based on the xe userptr code, which in a future patch will directly use gpusvm, so needs alignment here.
v2: - Add kernel-doc (Matt B) - s/fls/ilog2/ (Thomas)
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-40336?
CVE-2025-40336 is classified as a moderate severity vulnerability in the Linux kernel.
How do I fix CVE-2025-40336?
To fix CVE-2025-40336, users should update their Linux kernel to the latest patched version.
What impact does CVE-2025-40336 have on systems?
CVE-2025-40336 may lead to incorrect memory mapping, potentially exposing sensitive information or causing instability.
Which versions of Linux are affected by CVE-2025-40336?
CVE-2025-40336 affects multiple versions of the Linux kernel that implement drm/gpusvm functionality.
Is CVE-2025-40336 actively being exploited?
As of now, there are no reports indicating that CVE-2025-40336 is actively being exploited in the wild.