HighFix available

drop_monitor: fix size calculations for 64-bit attributes

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: drop_monitor: fix size calculations for 64-bit attributes net_dm_packet_report_fill() and net_dm_hw_packet_report_fill() use nla_put_u64_64bit() to append 64-bit attributes (NET_DM_ATTR_PC and NET_DM_ATTR_TIMESTAMP). On 32-bit architectures without CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS, nla_put_u64_64bit() may append a 4-byte NET_DM_ATTR_PAD attribute for 64-bit alignment. However, net_dm_packet_report_size() and net_dm_hw_packet_report_size() used nla_total_size(sizeof(u64)) instead of nla_total_size_64bit(sizeof(u64)), budgeting 12 bytes instead of up to 16 bytes. This under-estimation of SKB size can lead to an skb_over_panic() when __nla_reserve() or skb_put() is subsequently called. Fix this by using nla_total_size_64bit(sizeof(u64)) in both size calculations.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.1.189, 6.12.111, 6.18.53, 6.6.158, 7.1.6
CVEs: CVE-2026-68287
Confirmed fixed CVEs: Not specified
Updated in this feed: 5 Nov 2026, 04:14 UTC · Revision 1

Source evidence

drop_monitor: fix size calculations for 64-bit attributes

core-osv · Original source

Published 10 Aug 2026, 12:02 UTC

osv:CVE-2026-68287

Kernel

Fixed versions: 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.1.6

Complete source record

{
  "id": "c405c9288015bea19f2f642a5778d14ed43b1a4807cb932ab407a26af6f630be",
  "url": "https://osv.dev/vulnerability/CVE-2026-68287",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drop_monitor: fix size calculations for 64-bit attributes",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drop_monitor: fix size calculations for 64-bit attributes net_dm_packet_report_fill() and net_dm_hw_packet_report_fill() use nla_put_u64_64bit() to append 64-bit attributes (NET_DM_ATTR_PC and NET_DM_ATTR_TIMESTAMP). On 32-bit architectures without CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS, nla_put_u64_64bit() may append a 4-byte NET_DM_ATTR_PAD attribute for 64-bit alignment. However, net_dm_packet_report_size() and net_dm_hw_packet_report_size() used nla_total_size(sizeof(u64)) instead of nla_total_size_64bit(sizeof(u64)), budgeting 12 bytes instead of up to 16 bytes. This under-estimation of SKB size can lead to an skb_over_panic() when __nla_reserve() or skb_put() is subsequently called. Fix this by using nla_total_size_64bit(sizeof(u64)) in both size calculations.",
    "evidence": "osv:CVE-2026-68287",
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      "modified": "2026-10-28T02:30:42.451479478Z",
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      "references": [
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  "source_id": "core-osv",
  "document_id": 510194,
  "published_at": "2026-08-10T12:02:20.11+00:00"
}