CVE-2026-64244

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drivers/base/memory: set mem-&gt;altmap after successful device registration<br /> <br /> If __add_memory_block() fails at xa_store() (under memory pressure for<br /> example), device_unregister() is called, which eventually triggers<br /> memory_block_release() with mem-&gt;altmap still set, causing a<br /> WARN_ON(mem-&gt;altmap). This was triggered by modifying virtio-mem driver.<br /> <br /> Fix this by delaying the assignment of mem-&gt;altmap until after<br /> __add_memory_block() has succeeded.