CVE-2026-74721

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

accel/amxdna: Fix page-insertion errors in amdxdna_insert_pages()

Two error paths in amdxdna_insert_pages() called vma->vm_ops->close(vma)

before returning an error code to the caller. This is incorrect:

amdxdna_gem_obj_mmap() registers an HMM interval notifier before calling

amdxdna_insert_pages(), and on a hard error it jumps to hmm_unreg to undo

that registration. Calling vm_ops->close() manually — which drops the

shmem pages_pin_count and the GEM object reference that backs the VMA —

before the mmap syscall has even returned causes those resources to be

released while the VMA is still alive. The kernel VMA teardown will call

vm_ops->close() a second time when the process later unmaps the range,

producing a reference count underflow.

Replace both hard-error returns with a deferred-fault approach that keeps

the VMA alive and retries page insertion through the HMM range-fault path.