net: drop_monitor: fix info leak in NET_DM_ATTR_PAYLOAD

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Summary

CVECVE-2026-68288
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:18 UTC
Updated2026-08-10 13:20:18 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f 8fd6975d2aecc36b25ee82b6aef88e62a3527ccb git Not specified
CNA Linux Linux affected ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f 5e9c8baee0329fbefe7c67aea945e2a07f15e98b git Not specified
CNA Linux Linux affected 5.4 Not specified
CNA Linux Linux unaffected 5.4 semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8fd6975d2aecc36b25ee82b6aef88e62a3527ccb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5e9c8baee0329fbefe7c67aea945e2a07f15e98b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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