CVE-2026-90409drm/panthor: Add vm_bind region with kbo range overlap check

Official description

In the Linux kernel, the following vulnerability has been resolved: drm/panthor: Add vm_bind region with kbo range overlap check When a VM is created, caller has to specify the range of the address space carve-out set aside for mapping kernel BO's. That means vm_bind mappings of UM-exposed BO's should not intersect with that region, but at the moment we're not checking this. At first, I thought of giving these values to drm_gpuvm_init() through its reserve_{offset, range} arguments, but it turns out that is meant for VM address spans that are not managed through the usual drm_gpuvm split/merge circuit, so storing the end of the user VA range at VM creation time and doing a quick check in the vm_bind ioctl path was the simplest workaround. The new check also makes sure vm_bind range doesn't overflow the size of a 64-bit unsigned integer. That was already being done further down the call stack inside drm_gpuvm_sm_map -> drm_gpuvm_range_valid, but it's best to fail early in the driver before GPUVM functions are invoked so that we won't waste time allocating vm_bind context resources.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/276753aaad65e6f7dac7989a600c1c2d3a382c1a
• https://git.kernel.org/stable/c/f2be47fa8e225968eb66863657143fe900ec4bca
• https://git.kernel.org/stable/c/761cf9c63274a5b711c3dc829601723215710d2d
• https://git.kernel.org/stable/c/985f5e12f3cdf43030e13c2bbd154913133b5c3f