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CVE-2023-48409 is a local privilege-escalation vulnerability in the Google Pixel Mali GPU kernel driver. The flaw is in gpu_pixel_handle_buffer_liveness_update_ioctl in private/google-modules/gpu/mali_kbase/mali_kbase_core_linux.c, where attacker-controlled size calculations used for allocation can overflow. The vulnerable path allocates memory using an expression of the form kmalloc(buffer_info_size * 2 + live_ranges_size, GFP_KERNEL); if the supplied counts are large enough, the arithmetic can wrap, resulting in an undersized allocation followed by writes beyond the end of the allocated buffer. The resulting memory corruption is an out-of-bounds write in kernel context. Supporting analysis indicates the primitive can be shaped into an arbitrary-size kmalloc combined with an arbitrary-length, 0x10-byte-aligned buffer underflow/out-of-bounds write from the allocated object. On affected Pixel devices, this bug is reachable via the Mali GPU driver ioctl interface from an unprivileged local context.
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