{"id":"CVE-2026-68288","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: drop_monitor: fix info leak in NET_DM_ATTR_PAYLOAD\n\nnet_dm_packet_report_fill() and net_dm_hw_packet_report_fill() open code\nthe NET_DM_ATTR_PAYLOAD attribute to a…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: drop_monitor: fix info leak in NET_DM_ATTR_PAYLOAD\n\nnet_dm_packet_report_fill() and net_dm_hw_packet_report_fill() open code\nthe NET_DM_ATTR_PAYLOAD attribute to a…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f < 05173de42a9923a3eaadebcb0dd5bc83ffba174c","Linux >= ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f < 89178ffe5bddc99c057ba2768db1f8d9c5e1408c","Linux >= ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f < 8fd6975d2aecc36b25ee82b6aef88e62a3527ccb","Linux >= ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f < 5e9c8baee0329fbefe7c67aea945e2a07f15e98b","Linux 5.4"],"published":"2026-08-10","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:16.467","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-68288","references":[{"url":"https://git.kernel.org/stable/c/05173de42a9923a3eaadebcb0dd5bc83ffba174c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5e9c8baee0329fbefe7c67aea945e2a07f15e98b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/89178ffe5bddc99c057ba2768db1f8d9c5e1408c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8fd6975d2aecc36b25ee82b6aef88e62a3527ccb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00162,"epssPercentile":0.05872,"ingestedAt":"2026-09-21T13:37:22.845Z","slug":"CVE-2026-68288","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: drop_monitor: fix info leak in NET_DM_ATTR_PAYLOAD\n\nnet_dm_packet_report_fill() and net_dm_hw_packet_report_fill() open code\nthe NET_DM_ATTR_PAYLOAD attribute to avoid zeroing the packet payload\nbefore overwriting it with skb_copy_bits().\n\nskb_put() reserves nla_total_size(payload_len), i.e. the header plus the\nNLA_ALIGN() padding, but only payload_len bytes are copied in. When\npayload_len is not a multiple of 4 the 1-3 padding bytes are never\ninitialized and are leaked to user space inside the netlink message.\n\nKMSAN confirms the leak for the software path when the packet payload\nlength is not 4-byte aligned:\n\n  BUG: KMSAN: kernel-infoleak in _copy_to_iter\n   _copy_to_iter\n   __skb_datagram_iter\n   skb_copy_datagram_iter\n   netlink_recvmsg\n   sock_recvmsg\n   __sys_recvfrom\n  Uninit was created at:\n   kmem_cache_alloc_node_noprof\n   __alloc_skb\n   net_dm_packet_work\n  Bytes 173-175 of 176 are uninitialized\n\nUse __nla_reserve(), which sets up the attribute header and zeroes the\npadding, instead of open coding the attribute construction.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}