A vulnerability, which was classified as critical , was found in Linux Kernel up to 7.0.12 . This vulnerability affects the function _nested in the library lib/refcount.c of the component tcp . Executing a manipulation of the argument rsk_refcnt can lead to use after free. This vulnerability is handled as CVE-2026-53260 . The attack can only be done within the local network. There is not any exploit available. You should upgrade the affected component.