CVE-2025-38692

Local service hang via cyclic exFAT chain

Published Sep 4, 2025 · Updated May 11, 2026

Infinite-loop denial of service in the Linux exFAT driver allows local users to hang filesystem operations through a corrupted volume. Five directory paths—exfat_count_dir_entries(), exfat_create_upcase_table(), exfat_load_bitmap(), exfat_find_dir_entry(), and exfat_check_dir_empty()—follow cyclic cluster chains without detecting a repeated cluster. Triggering the flaw requires local access to operate on a specially corrupted exFAT filesystem; affected operations can remain stuck and consume processing time.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Infinite-loop denial of service in the Linux exFAT driver allows local users to hang filesystem operations through a corrupted volume. Five directory paths—exfat_count_dir_entries(), exfat_create_upcase_table(), exfat_load_bitmap(), exfat_find_dir_entry(), and exfat_check_dir_empty()—follow cyclic cluster chains without detecting a repeated cluster. Triggering the flaw requires local access to operate on a specially corrupted exFAT filesystem; affected operations can remain stuck and consume processing time.

The record

CVE
CVE-2025-38692
Published
Sep 4, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-835, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2025CVE 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=1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 <4c3cda20c4cf1871e27868d08fda06b79bc7d568
  2. Affected versionversion=1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 <868f23286c1a13162330fa6c614fe350f78e3f82
  3. Affected versionversion=1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 <99f9a97dce39ad413c39b92c90393bbd6778f3fd
  4. Affected versionversion=1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 <aa8fe7b7b73d4c9a41bb96cb3fb3092f794ecb33
  5. Affected versionversion=1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 <e2066ca3ef49a30920d8536fa366b2a183a808ee
  6. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 <4c3cda20c4cf1871e27868d08fda06b79bc7d568; version=1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 <868f23286c1a13162330fa6c614fe350f78e3f82; version=1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 <99f9a97dce39ad413c39b92c90393bbd6778f3fd; version=1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 <aa8fe7b7b73d4c9a41bb96cb3fb3092f794ecb33; version=1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 <e2066ca3ef49a30920d8536fa366b2a183a808ee; version=5.7

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-835Loop with Unreachable Exit Condition ('Infinite Loop')
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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