CVE-2023-53585: In the Linux kernel, the following vulnerability has been resolved: bpf: reject unhashed sockets in bpf_sk_assign The

A vulnerability in the Linux kernel's bpf_sk_assign function (a BPF helper that assigns sockets to network packets) could cause a memory leak when unhashed UDP sockets (sockets not yet bound to a port) are used. The problem occurs because the function assumes a socket flag called SOCK_RCU_FREE stays constant, but this flag gets set when an unhashed socket is later bound to a port, breaking the function's memory management logic.