CVE-2026-43085

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator

When batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send()

appends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via

nlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put()

helper only zeroes alignment padding after the payload, not the payload

itself, so four bytes of stale kernel heap data are leaked to userspace

in the NLMSG_DONE message body.

Use nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes

the nfgenmsg payload via nfnl_fill_hdr(), consistent with how

__build_packet_message() already constructs NFULNL_MSG_PACKET headers.