CVE-2023-52852

Kernel privilege escalation via freed decompression context

Published May 21, 2024 · Updated Aug 5, 2026

Use-after-free in Linux F2FS compression allows local users to crash the kernel or execute code via reads of compressed files. The f2fs_read_multi_pages() loop continues after f2fs_decompress_cluster() releases its decompress_io_ctx on a compress_inode cache hit, then accesses the freed context and page pointers. Reachability requires read access to a compressed F2FS file on a volume using the compressed-block cache; exploitation can panic the kernel or gain kernel privileges.

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

Use-after-free in Linux F2FS compression allows local users to crash the kernel or execute code via reads of compressed files. The f2fs_read_multi_pages() loop continues after f2fs_decompress_cluster() releases its decompress_io_ctx on a compress_inode cache hit, then accesses the freed context and page pointers. Reachability requires read access to a compressed F2FS file on a volume using the compressed-block cache; exploitation can panic the kernel or gain kernel privileges.

The record

CVE
CVE-2023-52852
Published
May 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=5.13.19 <5.14
  2. Affected versionversion=5.14
  3. Affected versionversion=6ce19aff0b8cd386860855185c6cd79337fc4d2b <8c4504cc0c64862740a6acb301e0cfa59580dbc5
  4. Affected versionversion=6ce19aff0b8cd386860855185c6cd79337fc4d2b <932ddb5c29e884cc6fac20417ece72ba4a35c401
  5. Affected versionversion=6ce19aff0b8cd386860855185c6cd79337fc4d2b <9375ea7f269093d7c884857ae1f47633a91f429c
  6. Affected versionversion=6ce19aff0b8cd386860855185c6cd79337fc4d2b <9d065aa52b6ee1b06f9c4eca881c9b4425a12ba2
  7. Affected versionversion=6ce19aff0b8cd386860855185c6cd79337fc4d2b <b0327c84e91a0f4f0abced8cb83ec86a7083f086
  8. Affected versionversion=a23706426da9b611be5beae0f3faa260fb453b4e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13.19 <5.14; version=5.14; version=6ce19aff0b8cd386860855185c6cd79337fc4d2b <8c4504cc0c64862740a6acb301e0cfa59580dbc5; version=6ce19aff0b8cd386860855185c6cd79337fc4d2b <932ddb5c29e884cc6fac20417ece72ba4a35c401; version=6ce19aff0b8cd386860855185c6cd79337fc4d2b <9375ea7f269093d7c884857ae1f47633a91f429c; version=6ce19aff0b8cd386860855185c6cd79337fc4d2b <9d065aa52b6ee1b06f9c4eca881c9b4425a12ba2; version=6ce19aff0b8cd386860855185c6cd79337fc4d2b <b0327c84e91a0f4f0abced8cb83ec86a7083f086; version=a23706426da9b611be5beae0f3faa260fb453b4e

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux kernel CVE teamCVSS: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.

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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
T1068Exploitation for Privilege Escalation

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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