CVE-2023-53326

Kernel crash via NULL pt_regs dereference

Published Sep 16, 2025 · Updated Sep 16, 2025

NULL pointer dereference in Linux PowerPC ptrace regset code allows local users to crash systems during coredump generation. In ppr_get(), the regset path passes a PF_IO_WORKER task's NULL pt_regs pointer to memcpy while collecting PPR state. A PowerPC system, a PF_IO_WORKER task, and coredump generation are required; the resulting kernel oops interrupts the system.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux PowerPC ptrace regset code allows local users to crash systems during coredump generation. In ppr_get(), the regset path passes a PF_IO_WORKER task's NULL pt_regs pointer to memcpy while collecting PPR state. A PowerPC system, a PF_IO_WORKER task, and coredump generation are required; the resulting kernel oops interrupts the system.

The record

CVE
CVE-2023-53326
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=4.8
  2. Affected versionversion=fa439810cc1b3c927ec24ede17d02467e1b143a1 <01849382373b867ddcbe7536b9dfa89f3bcea60e
  3. Affected versionversion=fa439810cc1b3c927ec24ede17d02467e1b143a1 <064a1c7b0f8403260d77627e62424a72ca26cee2
  4. Affected versionversion=fa439810cc1b3c927ec24ede17d02467e1b143a1 <7624973bc15b76d000e8e6f9b8080fcb76d36595
  5. Affected versionversion=fa439810cc1b3c927ec24ede17d02467e1b143a1 <80a4200d51e5a7e046f4a90f5faa5bafd5a60c58
  6. Affected versionversion=fa439810cc1b3c927ec24ede17d02467e1b143a1 <fd7276189450110ed835eb0a334e62d2f1c4e3be

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.8; version=fa439810cc1b3c927ec24ede17d02467e1b143a1 <01849382373b867ddcbe7536b9dfa89f3bcea60e; version=fa439810cc1b3c927ec24ede17d02467e1b143a1 <064a1c7b0f8403260d77627e62424a72ca26cee2; version=fa439810cc1b3c927ec24ede17d02467e1b143a1 <7624973bc15b76d000e8e6f9b8080fcb76d36595; version=fa439810cc1b3c927ec24ede17d02467e1b143a1 <80a4200d51e5a7e046f4a90f5faa5bafd5a60c58; version=fa439810cc1b3c927ec24ede17d02467e1b143a1 <fd7276189450110ed835eb0a334e62d2f1c4e3be

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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