VulnerabilityPublished 4 Sep 2025Updated 30 Oct 2026

CVE-2025-38692: Linux kernel · exfat: add cluster chain loop check for dir

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e2066ca3ef49a30920d8536fa366b2a183a808ee : update Linux kernel when convenient.

Data as of 30 Oct 2026, 12:33 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Patch: Available – fixed in e2066ca3ef49a30920d8536fa366b2a183a808ee, aa8fe7b7b73d4c9a41bb96cb3fb3092f794ecb33, 1715f0996f7baf817c73613aeda500c4f73a6bd6 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 4 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003, < e2066ca3ef49a30920d8536fa366b2a183a808ee	Fixed in e2066ca3ef49a30920d8536fa366b2a183a808ee
LinuxLinux	Affected ≥ 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003, < aa8fe7b7b73d4c9a41bb96cb3fb3092f794ecb33	Fixed in aa8fe7b7b73d4c9a41bb96cb3fb3092f794ecb33
LinuxLinux	Affected ≥ 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003, < 1715f0996f7baf817c73613aeda500c4f73a6bd6	Fixed in 1715f0996f7baf817c73613aeda500c4f73a6bd6
LinuxLinux	Affected ≥ 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003, < 868f23286c1a13162330fa6c614fe350f78e3f82	Fixed in 868f23286c1a13162330fa6c614fe350f78e3f82
LinuxLinux	Affected ≥ 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003, < 99f9a97dce39ad413c39b92c90393bbd6778f3fd	Fixed in 99f9a97dce39ad413c39b92c90393bbd6778f3fd
LinuxLinux	Affected ≥ 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003, < 4c3cda20c4cf1871e27868d08fda06b79bc7d568	Fixed in 4c3cda20c4cf1871e27868d08fda06b79bc7d568

Description

In the Linux kernel, the following vulnerability has been resolved: exfat: add cluster chain loop check for dir An infinite loop may occur if the following conditions occur due to file system corruption. (1) Condition for exfat_count_dir_entries() to loop infinitely. - The cluster chain includes a loop. - There is no UNUSED entry in the cluster chain. (2) Condition for exfat_create_upcase_table() to loop infinitely. - The cluster chain of the root directory includes a loop. - There are no UNUSED entry and up-case table entry in the cluster chain of the root directory. (3) Condition for exfat_load_bitmap() to loop infinitely. - The cluster chain of the root directory includes a loop. - There are no UNUSED entry and bitmap entry in the cluster chain of the root directory. (4) Condition for exfat_find_dir_entry() to loop infinitely. - The cluster chain includes a loop. - The unused directory entries were exhausted by some operation. (5) Condition for exfat_check_dir_empty() to loop infinitely. - The cluster chain includes a loop. - The unused directory entries were exhausted by some operation. - All files and sub-directories under the directory are deleted. This commit adds checks to break the above infinite loop.

References

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