CVE-2023-52566

Local service interruption via garbage-collection use-after-free

Published Mar 2, 2024 · Updated May 11, 2026

Use-after-free in Linux kernel NILFS2 allows local users to interrupt service through a crafted garbage-collection ioctl. nilfs_gccache_submit_read_data releases a buffer head after nilfs_dat_translate fails, then dereferences bh->b_page after the buffer may have been freed. Reaching the faulty path requires low-privilege local access plus a deliberately modified GC library or a direct GC ioctl; standard userland tools do not execute it.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel NILFS2 allows local users to interrupt service through a crafted garbage-collection ioctl. nilfs_gccache_submit_read_data releases a buffer head after nilfs_dat_translate fails, then dereferences bh->b_page after the buffer may have been freed. Reaching the faulty path requires low-privilege local access plus a deliberately modified GC library or a direct GC ioctl; standard userland tools do not execute it.

The record

CVE
CVE-2023-52566
Published
Mar 2, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 2, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.6.30
  2. Affected versionversion=a3d93f709e893187d301aa5458b2248db9f22bd1 <193b5a1c6c67c36b430989dc063fe7ea4e200a33
  3. Affected versionversion=a3d93f709e893187d301aa5458b2248db9f22bd1 <28df4646ad8b433340772edc90ca709cdefc53e2
  4. Affected versionversion=a3d93f709e893187d301aa5458b2248db9f22bd1 <3936e8714907cd55e37c7cc50e50229e4a9042e8
  5. Affected versionversion=a3d93f709e893187d301aa5458b2248db9f22bd1 <7130a87ca32396eb9bf48b71a2d42259ae44c6c7
  6. Affected versionversion=a3d93f709e893187d301aa5458b2248db9f22bd1 <7ee29facd8a9c5a26079148e36bcf07141b3a6bc
  7. Affected versionversion=a3d93f709e893187d301aa5458b2248db9f22bd1 <980663f1d189eedafd18d80053d9cf3e2ceb5c8c
  8. Affected versionversion=a3d93f709e893187d301aa5458b2248db9f22bd1 <bb61224f6abc8e71bfdf06d7c984e23460875f5b
  9. Affected versionversion=a3d93f709e893187d301aa5458b2248db9f22bd1 <fb1084e63ee56958b0a56e17a50a4fd86445b9c1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.30; version=a3d93f709e893187d301aa5458b2248db9f22bd1 <193b5a1c6c67c36b430989dc063fe7ea4e200a33; version=a3d93f709e893187d301aa5458b2248db9f22bd1 <28df4646ad8b433340772edc90ca709cdefc53e2; version=a3d93f709e893187d301aa5458b2248db9f22bd1 <3936e8714907cd55e37c7cc50e50229e4a9042e8; version=a3d93f709e893187d301aa5458b2248db9f22bd1 <7130a87ca32396eb9bf48b71a2d42259ae44c6c7; version=a3d93f709e893187d301aa5458b2248db9f22bd1 <7ee29facd8a9c5a26079148e36bcf07141b3a6bc; version=a3d93f709e893187d301aa5458b2248db9f22bd1 <980663f1d189eedafd18d80053d9cf3e2ceb5c8c; version=a3d93f709e893187d301aa5458b2248db9f22bd1 <bb61224f6abc8e71bfdf06d7c984e23460875f5b; version=a3d93f709e893187d301aa5458b2248db9f22bd1 <fb1084e63ee56958b0a56e17a50a4fd86445b9c1

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 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-416Use After Free
T1499.004Application or System Exploitation

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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