Bug 2516552 (CVE-2026-72093)

Summary: CVE-2026-72093 kernel: accel/amdxdna: Fix use-after-free in amdxdna_gem_dmabuf_mmap()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel, specifically within the amdxdna graphics driver. This vulnerability is a use-after-free error, where a memory object is incorrectly freed twice when certain memory allocation operations fail. This leads to memory corruption. A local attacker could potentially exploit this flaw to cause a system crash (denial of service) or gain elevated privileges.
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Description OSIDB Bzimport 2026-08-15 06:18:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

accel/amdxdna: Fix use-after-free in amdxdna_gem_dmabuf_mmap()

When vm_insert_pages() fails, the error path calls vma->vm_ops->close(vma)
which internally calls drm_gem_vm_close() → drm_gem_object_put(),
releasing the GEM object reference acquired at the start of the function.
However, the close_vma label then falls through to put_obj, which calls
drm_gem_object_put() a second time on the same object.

If the first put releases the last reference, the object is freed and the
second put accesses freed memory, causing a use-after-free.

Fix by returning directly from close_vma instead of falling through to
put_obj, since the close handler already performs all necessary cleanup
including the object put.
Comment 1 Keith Grant 2026-08-17 21:05:42 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081523-CVE-2026-72093-a1ce@gregkh/T