CVE-2026-99097

In the Linux kernel, the following vulnerability has been resolved:

tee: shm: reject zero-sized allocations in tee dyn shm alloc helper()

tee dyn shm alloc helper() derives nr pages from a caller-supplied size and passes it to alloc pages exact() without checking it. For size == 0 nr pages is 0, and alloc pages exact(0) calls get order(0), which is documented as undefined and returns BITS PER LONG - PAGE SHIFT. The page allocator then trips its order > MAX PAGE ORDER warning and fails the allocation; on a panic on warn kernel that ends the boot.

This can be triggered by TEE IOC SHM ALLOC with struct tee ioctl shm alloc data where size is 0.

Reject a zero page count, as register shm helper() already does for the register path.