CVE-2023-52705

Writer-thread hang via second-superblock offset underflow

Published May 21, 2024 · Updated May 11, 2026

Integer underflow in Linux 2.6.30 through 6.2-rc2 nilfs2 allows local users to hang a writer thread via a sub-4096-byte volume. NILFS_SB2_OFFSET_BYTES subtracts the secondary-superblock reservation from a device size below 4096 bytes, wrapping the offset; nilfs_resize_fs then passes an enormous segment count to nilfs_sufile_resize. Reaching the mount or resize path requires local access and filesystem-management privileges, and the resulting out-of-bounds I/O or prolonged semaphore wait can interrupt filesystem writers.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in Linux 2.6.30 through 6.2-rc2 nilfs2 allows local users to hang a writer thread via a sub-4096-byte volume. NILFS_SB2_OFFSET_BYTES subtracts the secondary-superblock reservation from a device size below 4096 bytes, wrapping the offset; nilfs_resize_fs then passes an enormous segment count to nilfs_sufile_resize. Reaching the mount or resize path requires local access and filesystem-management privileges, and the resulting out-of-bounds I/O or prolonged semaphore wait can interrupt filesystem writers.

The record

CVE
CVE-2023-52705
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-191, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=2.6.30
  2. Affected versionversion=e339ad31f59925b48a92ee3947692fdf9758b8c7 <0ee5ed0126a2211f7174492da2ca2c29f43755c5
  3. Affected versionversion=e339ad31f59925b48a92ee3947692fdf9758b8c7 <2f7a1135b202977b82457adde7db6c390056863b
  4. Affected versionversion=e339ad31f59925b48a92ee3947692fdf9758b8c7 <52844d8382cd9166d708032def8905ffc3ae550f
  5. Affected versionversion=e339ad31f59925b48a92ee3947692fdf9758b8c7 <99b9402a36f0799f25feee4465bfa4b8dfa74b4d
  6. Affected versionversion=e339ad31f59925b48a92ee3947692fdf9758b8c7 <a158782b56b070485d54d25fc9aaf2c8f3752205
  7. Affected versionversion=e339ad31f59925b48a92ee3947692fdf9758b8c7 <a8ef5109f93cea9933bbac0455d8c18757b3fcb4
  8. Affected versionversion=e339ad31f59925b48a92ee3947692fdf9758b8c7 <b96591e2c35c8b47db0ec816b5fc6cb8868000ff

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.30; version=e339ad31f59925b48a92ee3947692fdf9758b8c7 <0ee5ed0126a2211f7174492da2ca2c29f43755c5; version=e339ad31f59925b48a92ee3947692fdf9758b8c7 <2f7a1135b202977b82457adde7db6c390056863b; version=e339ad31f59925b48a92ee3947692fdf9758b8c7 <52844d8382cd9166d708032def8905ffc3ae550f; version=e339ad31f59925b48a92ee3947692fdf9758b8c7 <99b9402a36f0799f25feee4465bfa4b8dfa74b4d; version=e339ad31f59925b48a92ee3947692fdf9758b8c7 <a158782b56b070485d54d25fc9aaf2c8f3752205; version=e339ad31f59925b48a92ee3947692fdf9758b8c7 <a8ef5109f93cea9933bbac0455d8c18757b3fcb4; version=e339ad31f59925b48a92ee3947692fdf9758b8c7 <b96591e2c35c8b47db0ec816b5fc6cb8868000ff

Published CVSS scores

5.5NISTCVSS: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-191Integer Underflow (Wrap or Wraparound)
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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