CVE-2023-52497

Local file corruption via misordered LZ4 buffers

Published Feb 29, 2024 · Updated Aug 5, 2026

Out-of-bounds write in Linux kernel EROFS allows local users to corrupt decompressed file data through reads of LZ4-compressed files. The overlap handler maps compressed input and output as separate virtual buffers whose uncertain ordering violates LZ4 memmove assumptions. Reachability requires a mounted compressed EROFS filesystem and is exposed most clearly on FSRM-capable x86 processors, where corrupted page-cache contents can disrupt the system until reboot.

CVSS severity6.1
Medium
EPSS probability0.28%
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 write in Linux kernel EROFS allows local users to corrupt decompressed file data through reads of LZ4-compressed files. The overlap handler maps compressed input and output as separate virtual buffers whose uncertain ordering violates LZ4 memmove assumptions. Reachability requires a mounted compressed EROFS filesystem and is exposed most clearly on FSRM-capable x86 processors, where corrupted page-cache contents can disrupt the system until reboot.

The record

CVE
CVE-2023-52497
Published
Feb 29, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=0ffd71bcc3a03ebb3551661a36052488369c4de9 <33bf23c9940dbd3a22aad7f0cda4c84ed5701847
  2. Affected versionversion=0ffd71bcc3a03ebb3551661a36052488369c4de9 <3c12466b6b7bf1e56f9b32c366a3d83d87afb4de
  3. Affected versionversion=0ffd71bcc3a03ebb3551661a36052488369c4de9 <77cbc04a1a8610e303a0e0d74f2676667876a184
  4. Affected versionversion=0ffd71bcc3a03ebb3551661a36052488369c4de9 <9ff2d260b25df6fe1341a79113d88fecf6bd553e
  5. Affected versionversion=0ffd71bcc3a03ebb3551661a36052488369c4de9 <a0180e940cf1aefa7d516e20b259ad34f7a8b379
  6. Affected versionversion=0ffd71bcc3a03ebb3551661a36052488369c4de9 <bffc4cc334c5bb31ded54bc3cfd651735a3cb79e
  7. Affected versionversion=0ffd71bcc3a03ebb3551661a36052488369c4de9 <f36d200a80a3ca025532ed60dd1ac21b620e14ae
  8. Affected versionversion=5.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0ffd71bcc3a03ebb3551661a36052488369c4de9 <33bf23c9940dbd3a22aad7f0cda4c84ed5701847; version=0ffd71bcc3a03ebb3551661a36052488369c4de9 <3c12466b6b7bf1e56f9b32c366a3d83d87afb4de; version=0ffd71bcc3a03ebb3551661a36052488369c4de9 <77cbc04a1a8610e303a0e0d74f2676667876a184; version=0ffd71bcc3a03ebb3551661a36052488369c4de9 <9ff2d260b25df6fe1341a79113d88fecf6bd553e; version=0ffd71bcc3a03ebb3551661a36052488369c4de9 <a0180e940cf1aefa7d516e20b259ad34f7a8b379; version=0ffd71bcc3a03ebb3551661a36052488369c4de9 <bffc4cc334c5bb31ded54bc3cfd651735a3cb79e; version=0ffd71bcc3a03ebb3551661a36052488369c4de9 <f36d200a80a3ca025532ed60dd1ac21b620e14ae; version=5.3

Published CVSS scores

4.4SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
6.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/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-787Out-of-bounds Write
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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