CVE-2023-54092

Protected-VM crash via uncleared ASCE page index

Published Dec 24, 2025 · Updated Dec 24, 2025

Improper page-index handling in Linux KVM s390 allows local users to crash a protected virtual machine during ASCE replacement. The s390_replace_asce function fails to reset the replacement guest ASCE page index to zero, causing PTE invalidation notifications to carry incorrect addresses. Triggering the crash requires s390 protected virtualization, replacement of a guest ASCE, later unmapping of the prefix, and notifier execution.

CVSS severity8.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper page-index handling in Linux KVM s390 allows local users to crash a protected virtual machine during ASCE replacement. The s390_replace_asce function fails to reset the replacement guest ASCE page index to zero, causing PTE invalidation notifications to carry incorrect addresses. Triggering the crash requires s390 protected virtualization, replacement of a guest ASCE, later unmapping of the prefix, and notifier execution.

The record

CVE
CVE-2023-54092
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.0
  2. Affected versionversion=63c71e83d5b6ab8adb5fcebef977052048016957
  3. Affected versionversion=81ea65c9aefe100a9ace3082649bd84ae7dd9764 <49a2686adddebe1ae76b4d368383208656ef6606
  4. Affected versionversion=9d216035d173214cd33712d67d89220ef2283ebf <8e635da0e0d3cb45e32fa79b36218fb98281bc10
  5. Affected versionversion=b5477f53e1d4de6191f50748a027251b14952eeb
  6. Affected versionversion=faa2f72cb3569256480c5540d242c84e99965160 <017f686bcb536ff23d49c143fdf9d1fd89a9a924
  7. Affected versionversion=faa2f72cb3569256480c5540d242c84e99965160 <c2fceb59bbda16468bda82b002383bff59de89ab
  8. Affected versionversion=faa2f72cb3569256480c5540d242c84e99965160 <f1c7a776338f2ac5e34da40e58fe9f33ea390a5e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=63c71e83d5b6ab8adb5fcebef977052048016957; version=81ea65c9aefe100a9ace3082649bd84ae7dd9764 <49a2686adddebe1ae76b4d368383208656ef6606; version=9d216035d173214cd33712d67d89220ef2283ebf <8e635da0e0d3cb45e32fa79b36218fb98281bc10; version=b5477f53e1d4de6191f50748a027251b14952eeb; version=faa2f72cb3569256480c5540d242c84e99965160 <017f686bcb536ff23d49c143fdf9d1fd89a9a924; version=faa2f72cb3569256480c5540d242c84e99965160 <c2fceb59bbda16468bda82b002383bff59de89ab; version=faa2f72cb3569256480c5540d242c84e99965160 <f1c7a776338f2ac5e34da40e58fe9f33ea390a5e

Published CVSS scores

8.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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