CVE-2023-54267

Diagnostic warning via preemptible lppaca pointer access

Published Dec 30, 2025 · Updated Dec 30, 2025

Preemption-check misuse in affected Linux kernel builds allows local users to trigger a DEBUG_PREEMPT warning by reading /proc/powerpc/lparcfg. The lppaca_shared_proc() helper obtains an lppaca pointer through get_lppaca(), which invokes a preemption check from preemptible lparcfg code. Reachability requires a PowerPC pSeries kernel built with DEBUG_PREEMPT; the shared processor state remains correct despite the warning.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Preemption-check misuse in affected Linux kernel builds allows local users to trigger a DEBUG_PREEMPT warning by reading /proc/powerpc/lparcfg. The lppaca_shared_proc() helper obtains an lppaca pointer through get_lppaca(), which invokes a preemption check from preemptible lparcfg code. Reachability requires a PowerPC pSeries kernel built with DEBUG_PREEMPT; the shared processor state remains correct despite the warning.

The record

CVE
CVE-2023-54267
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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=3.12
  2. Affected versionversion=f13c13a005127b5dc5daaca190277a062d946e63 <2935443dc9c28499223d8c881474259e4b998f2a
  3. Affected versionversion=f13c13a005127b5dc5daaca190277a062d946e63 <3c5e8e666794d7dde6d14ea846c6c04f2bb34900
  4. Affected versionversion=f13c13a005127b5dc5daaca190277a062d946e63 <4c8568cf4c45b415854195c8832b557cdefba57a
  5. Affected versionversion=f13c13a005127b5dc5daaca190277a062d946e63 <953c54dfdc5d3eb7243ed902b50acb5ea1db4355
  6. Affected versionversion=f13c13a005127b5dc5daaca190277a062d946e63 <eac030b22ea12cdfcbb2e941c21c03964403c63f
  7. Affected versionversion=f13c13a005127b5dc5daaca190277a062d946e63 <f45ee5c074013a0fbfce77a5af5efddb01f5d4f4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.12; version=f13c13a005127b5dc5daaca190277a062d946e63 <2935443dc9c28499223d8c881474259e4b998f2a; version=f13c13a005127b5dc5daaca190277a062d946e63 <3c5e8e666794d7dde6d14ea846c6c04f2bb34900; version=f13c13a005127b5dc5daaca190277a062d946e63 <4c8568cf4c45b415854195c8832b557cdefba57a; version=f13c13a005127b5dc5daaca190277a062d946e63 <953c54dfdc5d3eb7243ed902b50acb5ea1db4355; version=f13c13a005127b5dc5daaca190277a062d946e63 <eac030b22ea12cdfcbb2e941c21c03964403c63f; version=f13c13a005127b5dc5daaca190277a062d946e63 <f45ee5c074013a0fbfce77a5af5efddb01f5d4f4

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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