---
id: CVE-2023-54092
title: 'KVM: s390: pv: fix index value of replaced ASCE'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  KVM: s390: pv: fix index value of replaced ASCE

  The index field of the struct page corresponding to a guest ASCE should
  be 0. When replacing the ASCE in s390_replace_a…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9d216035d173214cd33712d67d89220ef2283ebf <
    8e635da0e0d3cb45e32fa79b36218fb98281bc10
  - >-
    Linux >= 81ea65c9aefe100a9ace3082649bd84ae7dd9764 <
    49a2686adddebe1ae76b4d368383208656ef6606
  - >-
    Linux >= faa2f72cb3569256480c5540d242c84e99965160 <
    017f686bcb536ff23d49c143fdf9d1fd89a9a924
  - >-
    Linux >= faa2f72cb3569256480c5540d242c84e99965160 <
    f1c7a776338f2ac5e34da40e58fe9f33ea390a5e
  - >-
    Linux >= faa2f72cb3569256480c5540d242c84e99965160 <
    c2fceb59bbda16468bda82b002383bff59de89ab
  - Linux b5477f53e1d4de6191f50748a027251b14952eeb
  - Linux 63c71e83d5b6ab8adb5fcebef977052048016957
  - Linux >= 5.10.137 < 5.10.190
  - Linux >= 5.15.61 < 5.15.124
  - Linux >= 5.18.18 < 5.19
  - Linux >= 5.19.2 < 5.20
  - Linux 6.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:38:20.518456Z'
published: '2025-12-24'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:41:39.384Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-54092'
references:
  - url: 'https://git.kernel.org/stable/c/8e635da0e0d3cb45e32fa79b36218fb98281bc10'
  - url: 'https://git.kernel.org/stable/c/49a2686adddebe1ae76b4d368383208656ef6606'
  - url: 'https://git.kernel.org/stable/c/017f686bcb536ff23d49c143fdf9d1fd89a9a924'
  - url: 'https://git.kernel.org/stable/c/f1c7a776338f2ac5e34da40e58fe9f33ea390a5e'
  - url: 'https://git.kernel.org/stable/c/c2fceb59bbda16468bda82b002383bff59de89ab'
tags:
  - cve.org
epss: 0.00219
epssPercentile: 0.11473
ingestedAt: '2026-10-15T22:48:25.429Z'
---

## Overview

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

KVM: s390: pv: fix index value of replaced ASCE

The index field of the struct page corresponding to a guest ASCE should
be 0. When replacing the ASCE in s390_replace_asce(), the index of the
new ASCE should also be set to 0.

Having the wrong index might lead to the wrong addresses being passed
around when notifying pte invalidations, and eventually to validity
intercepts (VM crash) if the prefix gets unmapped and the notifier gets
called with the wrong address.

## Affected

- `Linux >= 9d216035d173214cd33712d67d89220ef2283ebf < 8e635da0e0d3cb45e32fa79b36218fb98281bc10`
- `Linux >= 81ea65c9aefe100a9ace3082649bd84ae7dd9764 < 49a2686adddebe1ae76b4d368383208656ef6606`
- `Linux >= faa2f72cb3569256480c5540d242c84e99965160 < 017f686bcb536ff23d49c143fdf9d1fd89a9a924`
- `Linux >= faa2f72cb3569256480c5540d242c84e99965160 < f1c7a776338f2ac5e34da40e58fe9f33ea390a5e`
- `Linux >= faa2f72cb3569256480c5540d242c84e99965160 < c2fceb59bbda16468bda82b002383bff59de89ab`
- `Linux b5477f53e1d4de6191f50748a027251b14952eeb`
- `Linux 63c71e83d5b6ab8adb5fcebef977052048016957`
- `Linux >= 5.10.137 < 5.10.190`
- `Linux >= 5.15.61 < 5.15.124`
- `Linux >= 5.18.18 < 5.19`
- `Linux >= 5.19.2 < 5.20`
- `Linux 6.0`

## Remediation

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