CVE-2023-52628 netfilter: nftables: exthdr: fix 4-byte stack OOB write

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftables: exthdr: fix 4-byte stack OOB write If priv-len is a multiple of 4, then dstlen / 4 can write past the destination array which leads to stack corruption. This construct is necessary to clean the remainder of t...