CVE-2023-52770

Kernel panic via missing F2FS extent tree

Published May 21, 2024 · Updated May 23, 2026

NULL pointer dereference in the Linux kernel F2FS extent cache allows local users to crash the system through crafted file operations. Conditional allocation can leave an inode without an extent tree after its compression flag is cleared, and f2fs_drop_extent_tree then locks the missing tree during fallocate. Triggering the panic requires local low-privileged access to create and modify a file on a writable F2FS filesystem.

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 the Linux kernel F2FS extent cache allows local users to crash the system through crafted file operations. Conditional allocation can leave an inode without an extent tree after its compression flag is cleared, and f2fs_drop_extent_tree then locks the missing tree during fallocate. Triggering the panic requires local low-privileged access to create and modify a file on a writable F2FS filesystem.

The record

CVE
CVE-2023-52770
Published
May 21, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=4377b1d3b19e1369d094a94596211a9815ddbb04
  2. Affected versionversion=6.1.29 <6.2
  3. Affected versionversion=6.2
  4. Affected versionversion=72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a <9de787139b0258a5dd1f498780c26d76b61d2958
  5. Affected versionversion=72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a <d83309e7e006cee8afca83523559017c824fbf7a
  6. Affected versionversion=72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a <f803982190f0265fd36cf84670aa6daefc2b0768

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4377b1d3b19e1369d094a94596211a9815ddbb04; version=6.1.29 <6.2; version=6.2; version=72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a <9de787139b0258a5dd1f498780c26d76b61d2958; version=72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a <d83309e7e006cee8afca83523559017c824fbf7a; version=72840cccc0a1a0a0dc1bb27b669a9111be6d0f6a <f803982190f0265fd36cf84670aa6daefc2b0768

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

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-476NULL Pointer Dereference
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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