CVE-2026-74721

Sažetak

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.

Reference

CVSS

Base:	0.0
Impact:	None
Exploitability:	None

Pristup

Vektor	Složenost	Autentikacija
None	None	None

Impact

Povjerljivost	Cjelovitost	Dostupnost
None	None	None

CVSS vektor

None

Zadnje važnije ažuriranje

22-08-2026 - 16:16

Objavljeno

22-08-2026 - 16:16