Vulnerability Description
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.
References
- https://git.kernel.org/stable/c/1501e4d07c6fee0d50531a0d1cb2be01a63e6e75
- https://git.kernel.org/stable/c/8d51e0fd3e698919d2adeff71936377f0c0d4aa0
FAQ
What is CVE-2026-74721?
CVE-2026-74721 is a documented vulnerability. 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->cl...
How severe is CVE-2026-74721?
CVSS scoring is not yet available for CVE-2026-74721. Check NVD for updates.
Is there a patch for CVE-2026-74721?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.