Vulnerability 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.
References
- https://git.kernel.org/stable/c/5e9c8baee0329fbefe7c67aea945e2a07f15e98b
- https://git.kernel.org/stable/c/8fd6975d2aecc36b25ee82b6aef88e62a3527ccb
FAQ
What is CVE-2026-68288?
CVE-2026-68288 is a documented vulnerability. 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 t...
How severe is CVE-2026-68288?
CVSS scoring is not yet available for CVE-2026-68288. Check NVD for updates.
Is there a patch for CVE-2026-68288?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.