---
id: CVE-2026-89924
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  KVM: s390: Fix old_data leak in guest debug error path

  __import_wp_info() allocates a per-watchpoint old_data buffer to back up
  the original guest memory contents
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  KVM: s390: Fix old_data leak in guest debug error path

  __import_wp_info() allocates a per-watchpoint old_data buffer to back up
  the original guest memory contents. If …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    124c81ee610e1fbdd93d4399f88d9e28ba97a941
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    c85d402553987777cc4742751437ea5dcbf98a7b
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    5fbf319137735252eefa507193c9a619af5b7457
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    4048d0a252163084794be3e37995b872c5178913
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    f55e4d415d95342d5753e528e05a1e8623992c3f
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    46cb8a273e2f853f89a78b59dbdff8787b6e1c86
  - >-
    Linux >= 27291e2165b6de70c476b7b675308113edd69a60 <
    aa9c8e8baf1e765fa65b93212522c636f25d846f
  - Linux 3.16
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:17:01.527'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89924'
references:
  - url: 'https://git.kernel.org/stable/c/124c81ee610e1fbdd93d4399f88d9e28ba97a941'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4048d0a252163084794be3e37995b872c5178913'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/46cb8a273e2f853f89a78b59dbdff8787b6e1c86'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5fbf319137735252eefa507193c9a619af5b7457'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/aa9c8e8baf1e765fa65b93212522c636f25d846f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c85d402553987777cc4742751437ea5dcbf98a7b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f55e4d415d95342d5753e528e05a1e8623992c3f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.971Z'
epss: 0.00211
epssPercentile: 0.1161
---

## Overview

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

KVM: s390: Fix old_data leak in guest debug error path

__import_wp_info() allocates a per-watchpoint old_data buffer to back up
the original guest memory contents. If a later watchpoint of the same
KVM_SET_GUEST_DEBUG request fails to import, kvm_s390_import_bp_data()
jumps to the error label, which frees the wp_info array but not the
old_data buffers of the entries that were imported successfully. Up to
MAX_BP_COUNT - 1 buffers of up to MAX_WP_SIZE bytes are leaked per failed
request, and the request can be repeated.

Create error handling for cleaning up all created old_data memory
areas.

## Remediation

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