CVE-2026-52971

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: ena: PHC: Fix potential use-after-free in get_timestamp<br /> <br /> Move the phc-&gt;active check and resp pointer assignment to after<br /> acquiring the spinlock. Previously, phc-&gt;active was checked without<br /> holding the lock, and resp was cached from ena_dev-&gt;phc.virt_addr<br /> before the lock was acquired.<br /> <br /> If ena_com_phc_destroy() runs between the lockless active check and<br /> the lock acquisition, it sets active=false, releases the lock, frees<br /> the DMA memory, and sets virt_addr=NULL. The get_timestamp path would<br /> then read a NULL virt_addr and dereference it.<br /> <br /> With both the active check and the pointer read under the lock,<br /> destroy cannot free the memory while get_timestamp is using it.