CVE-2026-43085

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator<br /> <br /> When batching multiple NFLOG messages (inst-&gt;qlen &gt; 1), __nfulnl_send()<br /> appends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via<br /> nlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put()<br /> helper only zeroes alignment padding after the payload, not the payload<br /> itself, so four bytes of stale kernel heap data are leaked to userspace<br /> in the NLMSG_DONE message body.<br /> <br /> Use nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes<br /> the nfgenmsg payload via nfnl_fill_hdr(), consistent with how<br /> __build_packet_message() already constructs NFULNL_MSG_PACKET headers.