CVE-2023-52448

Kernel crash via unchecked GFS2 resource-group pointer

Published Feb 22, 2024 · Updated May 11, 2026

NULL pointer dereference in Linux kernel GFS2 allows local users to crash the kernel during resource-group index error handling. The gfs2_rgrp_dump() function dereferences rgd->rd_rgl without checking for NULL after read_rindex_entry() fails to create rgd->rd_gl. Reachability requires local low-privileged access and GFS2 resource-group index processing; the demonstrated consequence is an availability-only kernel crash.

CVSS severity5.5
Medium
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

NULL pointer dereference in Linux kernel GFS2 allows local users to crash the kernel during resource-group index error handling. The gfs2_rgrp_dump() function dereferences rgd->rd_rgl without checking for NULL after read_rindex_entry() fails to create rgd->rd_gl. Reachability requires local low-privileged access and GFS2 resource-group index processing; the demonstrated consequence is an availability-only kernel crash.

The record

CVE
CVE-2023-52448
Published
Feb 22, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
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=4.20
  2. Affected versionversion=72244b6bc752b5c496f09de9a13c18adc314a53c <067a7c48c2c70f05f9460d6f0e8423e234729f05
  3. Affected versionversion=72244b6bc752b5c496f09de9a13c18adc314a53c <5c28478af371a1c3fdb570ca67f110e1ae60fc37
  4. Affected versionversion=72244b6bc752b5c496f09de9a13c18adc314a53c <8877243beafa7c6bfc42022cbfdf9e39b25bd4fa
  5. Affected versionversion=72244b6bc752b5c496f09de9a13c18adc314a53c <c323efd620c741168c8e0cc6fc0be04ab57e331a
  6. Affected versionversion=72244b6bc752b5c496f09de9a13c18adc314a53c <d69d7804cf9e2ba171a27e5f98bc266f13d0414a
  7. Affected versionversion=72244b6bc752b5c496f09de9a13c18adc314a53c <ee0586d73cbaf0e7058bc640d62a9daf2dfa9178
  8. Affected versionversion=72244b6bc752b5c496f09de9a13c18adc314a53c <efc8ef87ab9185a23d5676f2f7d986022d91bcde

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=72244b6bc752b5c496f09de9a13c18adc314a53c <067a7c48c2c70f05f9460d6f0e8423e234729f05; version=72244b6bc752b5c496f09de9a13c18adc314a53c <5c28478af371a1c3fdb570ca67f110e1ae60fc37; version=72244b6bc752b5c496f09de9a13c18adc314a53c <8877243beafa7c6bfc42022cbfdf9e39b25bd4fa; version=72244b6bc752b5c496f09de9a13c18adc314a53c <c323efd620c741168c8e0cc6fc0be04ab57e331a; version=72244b6bc752b5c496f09de9a13c18adc314a53c <d69d7804cf9e2ba171a27e5f98bc266f13d0414a; version=72244b6bc752b5c496f09de9a13c18adc314a53c <ee0586d73cbaf0e7058bc640d62a9daf2dfa9178; version=72244b6bc752b5c496f09de9a13c18adc314a53c <efc8ef87ab9185a23d5676f2f7d986022d91bcde

Published CVSS scores

5.5NIST NVDCVSS: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

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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

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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