---
id: CVE-2026-68287
title: |-
  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 attri…
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 attri…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f <
    6048ed2dfb33426c8aef32f8d225ea91c66813db
  - >-
    Linux >= ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f <
    925669d4cfd47a9019ab29b40676215bab5dae35
  - >-
    Linux >= ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f <
    4a9e30764e80693bcf875c776170edce20f94fe0
  - >-
    Linux >= ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f <
    7089f7ab99c89f443c92d8fcc585e63f2727f0b3
  - Linux 5.4
published: '2026-08-10'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T14:17:16.310'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-68287'
references:
  - url: 'https://git.kernel.org/stable/c/4a9e30764e80693bcf875c776170edce20f94fe0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6048ed2dfb33426c8aef32f8d225ea91c66813db'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7089f7ab99c89f443c92d8fcc585e63f2727f0b3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/925669d4cfd47a9019ab29b40676215bab5dae35'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.0063
epssPercentile: 0.47901
ingestedAt: '2026-09-21T13:37:22.845Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.