CVE-2025-38639 netfilter: xt_nfacct: don't assume acct name is null-terminated

In the Linux kernel, the following vulnerability has been resolved: netfilter: xtnfacct: don't assume acct name is null-terminated BUG: KASAN: slab-out-of-bounds in .. lib/vsprintf.c:721 Read of size 1 at addr ffff88801eac95c8 by task syz-executor183/5851 .. string+0x231/0x2b0 lib/vsprintf.c:721...