CVE-2026-68288
Description
In the Linux kernel, the following vulnerability has been resolved: net: drop_monitor: fix info leak in NET_DM_ATTR_PAYLOAD net_dm_packet_report_fill() and net_dm_hw_packet_report_fill() open code the NET_DM_ATTR_PAYLOAD attribute to avoid zeroing the packet payload before overwriting it with skb_copy_bits(). skb_put() reserves nla_total_size(payload_len), i.e. the header plus the NLA_ALIGN() padding, but only payload_len bytes are copied in. When payload_len is not a multiple of 4 the 1-3 padding bytes are never initialized and are leaked to user space inside the netlink message. KMSAN confirms the leak for the software path when the packet payload length is not 4-byte aligned: BUG: KMSAN: kernel-infoleak in _copy_to_iter _copy_to_iter __skb_datagram_iter skb_copy_datagram_iter netlink_recvmsg sock_recvmsg __sys_recvfrom Uninit was created at: kmem_cache_alloc_node_noprof __alloc_skb net_dm_packet_work Bytes 173-175 of 176 are uninitialized Use __nla_reserve(), which sets up the attribute header and zeroes the padding, instead of open coding the attribute construction.
How to fix
- Linux Linuxd427b152b663cb2b19fcd449d792e17edbe4a938, 3c0bc7dcc5f9257d25c59eeb7ccb4df33dcfc446, 05173de42a9923a3eaadebcb0dd5bc83ffba174c, 89178ffe5bddc99c057ba2768db1f8d9c5e1408c, 8fd6975d2aecc36b25ee82b6aef88e62a3527ccb, 5e9c8baee0329fbefe7c67aea945e2a07f15e98b or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f ≤ v < d427b152b663cb2b19fcd449d792e17edbe4a938, ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f ≤ v < 3c0bc7dcc5f9257d25c59eeb7ccb4df33dcfc446, ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f ≤ v < 05173de42a9923a3eaadebcb0dd5bc83ffba174c, ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f ≤ v < 89178ffe5bddc99c057ba2768db1f8d9c5e1408c, ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f ≤ v < 8fd6975d2aecc36b25ee82b6aef88e62a3527ccb, ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f ≤ v < 5e9c8baee0329fbefe7c67aea945e2a07f15e98b, 5.4 | d427b152b663cb2b19fcd449d792e17edbe4a938, 3c0bc7dcc5f9257d25c59eeb7ccb4df33dcfc446, 05173de42a9923a3eaadebcb0dd5bc83ffba174c, 89178ffe5bddc99c057ba2768db1f8d9c5e1408c, 8fd6975d2aecc36b25ee82b6aef88e62a3527ccb, 5e9c8baee0329fbefe7c67aea945e2a07f15e98b |
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