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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f to < d427b152b663cb2b19fcd449d792e17edbe4a938affectedca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f to < 3c0bc7dcc5f9257d25c59eeb7ccb4df33dcfc446affectedca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f to < 05173de42a9923a3eaadebcb0dd5bc83ffba174caffectedca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f to < 89178ffe5bddc99c057ba2768db1f8d9c5e1408caffectedca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f to < 8fd6975d2aecc36b25ee82b6aef88e62a3527ccbaffectedca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f to < 5e9c8baee0329fbefe7c67aea945e2a07f15e98baffected
Linux Linux
Default version status: affected
5.4affected0 to < 5.4unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.53 to ≤ 6.18.*unaffected7.1.6 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/d427b152b663cb2b19fcd449d792e17edbe4a938 ↗
- https://git.kernel.org/stable/c/3c0bc7dcc5f9257d25c59eeb7ccb4df33dcfc446 ↗
- https://git.kernel.org/stable/c/05173de42a9923a3eaadebcb0dd5bc83ffba174c ↗
- https://git.kernel.org/stable/c/89178ffe5bddc99c057ba2768db1f8d9c5e1408c ↗
- https://git.kernel.org/stable/c/8fd6975d2aecc36b25ee82b6aef88e62a3527ccb ↗
- https://git.kernel.org/stable/c/5e9c8baee0329fbefe7c67aea945e2a07f15e98b ↗