Linux kernel (drm/panthor) vulnerabilities

In the Linux kernel, the drm/panthor driver does not verify that vm_bind mappings of user-exposed BOs avoid the region reserved for kernel BO mappings. This missing check can cause address space conflicts. The fix adds an overlap check and guards against 64-bit range overflow.

In the Linux kernel, panthor_fw_read_build_info() in the drm/panthor driver validates the metadata range using 32-bit addition (hdr.meta_start + hdr.meta_size), which can wrap and let an out-of-bounds range pass. It also reads the "git_sha: " prefix without checking metadata length, and meta_size == 0 can underflow the NULL terminator index.

In the Linux kernel, panthor_init_cs_iface() and panthor_init_csg_iface() in the drm/panthor driver validate firmware control interface offsets using 32-bit arithmetic and the size of host wrapper structures, so the arithmetic can wrap before the bounds check and the checked size does not match the actual mapped firmware control interface.