CVE-2023-52451

Kernel out-of-bounds read via failed DRC lookup

Published Feb 22, 2024 · Updated May 11, 2026

Out-of-bounds read in the Linux kernel powerpc/pseries memory-hotplug code allows local users to read beyond the drmem LMB array. A failed DRC-index search leaves dlpar_memory_remove_by_index() pointing one element past the array, and its debug path dereferences the invalid cursor. This path requires a local sysfs memory-hot-remove request; KASAN confirms an eight-byte slab read, and the debug message exposes a value from adjacent memory.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel powerpc/pseries memory-hotplug code allows local users to read beyond the drmem LMB array. A failed DRC-index search leaves dlpar_memory_remove_by_index() pointing one element past the array, and its debug path dereferences the invalid cursor. This path requires a local sysfs memory-hot-remove request; KASAN confirms an eight-byte slab read, and the debug message exposes a value from adjacent memory.

The record

CVE
CVE-2023-52451
Published
Feb 22, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=4.1
  2. Affected versionversion=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <026fd977dc50ff4a5e09bfb0603557f104d3f3a0
  3. Affected versionversion=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <708a4b59baad96c4718dc0bd3a3427d3ab22fedc
  4. Affected versionversion=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <999a27b3ce9a69d54ccd5db000ec3a447bc43e6d
  5. Affected versionversion=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <9b5f03500bc5b083c0df696d7dd169d7ef3dd0c7
  6. Affected versionversion=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <b582aa1f66411d4adcc1aa55b8c575683fb4687e
  7. Affected versionversion=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <bb79613a9a704469ddb8d6c6029d532a5cea384c
  8. Affected versionversion=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <bd68ffce69f6cf8ddd3a3c32549d1d2275e49fc5
  9. Affected versionversion=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <df16afba2378d985359812c865a15c05c70a967e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.1; version=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <026fd977dc50ff4a5e09bfb0603557f104d3f3a0; version=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <708a4b59baad96c4718dc0bd3a3427d3ab22fedc; version=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <999a27b3ce9a69d54ccd5db000ec3a447bc43e6d; version=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <9b5f03500bc5b083c0df696d7dd169d7ef3dd0c7; version=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <b582aa1f66411d4adcc1aa55b8c575683fb4687e; version=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <bb79613a9a704469ddb8d6c6029d532a5cea384c; version=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <bd68ffce69f6cf8ddd3a3c32549d1d2275e49fc5; version=51925fb3c5c901aa06cdc853268a6e19e19bcdc7 <df16afba2378d985359812c865a15c05c70a967e

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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.

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

CWE-129Improper Validation of Array Index

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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