CVE-2026-53248

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: airoha: Fix use-after-free in metadata dst teardown<br /> <br /> airoha_metadata_dst_free() runs metadata_dst_free() which frees the<br /> metadata_dst with kfree() immediately, bypassing the RCU grace period.<br /> In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from<br /> the skb to the metadata_dst. This function requires RCU read-side<br /> protection and the dst must remain valid until all RCU readers complete.<br /> Since metadata_dst_free() calls kfree() directly, an use-after-free can<br /> occur if any skb still holds a noref pointer to the dst when the driver<br /> tears it down.<br /> Replace metadata_dst_free() with dst_release() which properly goes<br /> through the refcount path: when the refcount drops to zero, it schedules<br /> the actual free via call_rcu_hurry(), ensuring all RCU readers have<br /> completed before the memory is freed.