---
id: CVE-2026-89926
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  KVM: s390: Fix length check __import_wp_info()

  struct kvm_hw_breakpoint::len is a __u64 that is fully controlled by user
  space
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  KVM: s390: Fix length check __import_wp_info()

  struct kvm_hw_breakpoint::len is a __u64 that is fully controlled by user
  space. This is then assigned to wp_info->len, …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    aef540194effd768bed0bd2e6a74fe135a3d7c3a
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    71153d3262517e1c02c3a66aa5094f279b2d1454
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    fec89d327d9b2b669b5bbdac209386c6317c3722
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    b94ab9caa5d72c78226121cccff5e33f946da900
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    beb9c55af609c4c7308259d7191688c75a4e3d4a
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    3fe801db90bdeefb0bbdda42d832846b53f64f8a
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    4c07680a467e2f7697245bcd11691bffb2a6f0ed
  - Linux 3.16
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:17:01.777'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89926'
references:
  - url: 'https://git.kernel.org/stable/c/3fe801db90bdeefb0bbdda42d832846b53f64f8a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4c07680a467e2f7697245bcd11691bffb2a6f0ed'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/71153d3262517e1c02c3a66aa5094f279b2d1454'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/aef540194effd768bed0bd2e6a74fe135a3d7c3a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b94ab9caa5d72c78226121cccff5e33f946da900'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/beb9c55af609c4c7308259d7191688c75a4e3d4a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fec89d327d9b2b669b5bbdac209386c6317c3722'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.970Z'
epss: 0.00205
epssPercentile: 0.10901
---

## Overview

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

KVM: s390: Fix length check __import_wp_info()

struct kvm_hw_breakpoint::len is a __u64 that is fully controlled by user
space. This is then assigned to wp_info->len, which is an int. The bounds
check is done on the truncated value while the allocation uses the
untruncated one:

	wp_info->len = bp_data->len;
	[...]
	if (wp_info->len < 0 || wp_info->len > MAX_WP_SIZE)
		return -EINVAL;

	wp_info->old_data = kmalloc(bp_data->len, GFP_KERNEL_ACCOUNT);

Use the validated value for the allocation as intended. Without this
fix userspace can trigger >4GB allocations which will fail and result
in a WARN due to MAX_PAGE_ORDER.

## Remediation

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