---
id: CVE-2026-63987
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ethtool: coalesce: cap profile updates at NET_DIM_PARAMS_NUM_PROFILES

  ethnl_update_profile() walks the ETHTOOL_A_PROFILE_IRQ_MODERATION
  nest list with an index 'i' and…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ethtool: coalesce: cap profile updates at NET_DIM_PARAMS_NUM_PROFILES

  ethnl_update_profile() walks the ETHTOOL_A_PROFILE_IRQ_MODERATION
  nest list with an index 'i' and…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.11, < 6.12.93'
  - 'linux_kernel >= 6.13, < 6.18.35'
  - 'linux_kernel >= 6.19, < 7.0.12'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.12
published: '2026-07-19'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T20:50:05.673'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63987'
references:
  - url: 'https://git.kernel.org/stable/c/0c02c190bcd9822477038ff2cee10ea584ac1b1d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6205f7166d2dd14a017a5802c81e5bd1421a8635'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7281b096b072f6c6e30420e3467d738f2e4c4b57'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d4c9cc7c47781c6f4fa29d80a1193a8bcd1525bc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00129
epssPercentile: 0.0215
ingestedAt: '2026-10-07T21:54:15.079Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

ethtool: coalesce: cap profile updates at NET_DIM_PARAMS_NUM_PROFILES

ethnl_update_profile() walks the ETHTOOL_A_PROFILE_IRQ_MODERATION
nest list with an index 'i' and writes new_profile[i++] without
bounding i. The destination is kmemdup()'d at NET_DIM_PARAMS_NUM_PROFILES
entries (5), but the Netlink nest count is entirely user-controlled.
Netlink policies do not have support for constraining the number
of nested entries (or number of multi-attr entries).

## Affected

- `linux_kernel >= 6.11, < 6.12.93`
- `linux_kernel >= 6.13, < 6.18.35`
- `linux_kernel >= 6.19, < 7.0.12`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.12`