CVE-2025-38172

Kernel memory corruption via mixed-device EROFS mount

Published Jul 3, 2025 · Updated Aug 5, 2026

Use-after-free in the EROFS mount path in Linux 6.12 through 6.15.2 allows local users to corrupt kernel memory via mixed device types. erofs_fc_get_tree treats ENOTBLK from erofs_init_device as a file-backed-mount signal after teardown has freed its superblock state, then writes a newly opened file into that freed state. The required state is an EROFS mount with a block-device primary and file-backed extra device; the published record does not specify post-corruption effects.

CVSS severity7.8
High
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

Use-after-free in the EROFS mount path in Linux 6.12 through 6.15.2 allows local users to corrupt kernel memory via mixed device types. erofs_fc_get_tree treats ENOTBLK from erofs_init_device as a file-backed-mount signal after teardown has freed its superblock state, then writes a newly opened file into that freed state. The required state is an EROFS mount with a block-device primary and file-backed extra device; the published record does not specify post-corruption effects.

The record

CVE
CVE-2025-38172
Published
Jul 3, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 3, 2025CVE 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=6.12
  2. Affected versionversion=fb176750266a3d7f42ebdcf28e8ba40350b27847 <65115472f741ca000d7ea4a5922214f93cd1516e
  3. Affected versionversion=fb176750266a3d7f42ebdcf28e8ba40350b27847 <9748f2f54f66743ac77275c34886a9f890e18409
  4. Affected versionversion=fb176750266a3d7f42ebdcf28e8ba40350b27847 <cd04beb9ce2773a16057248bb4fa424068ae3807

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=fb176750266a3d7f42ebdcf28e8ba40350b27847 <65115472f741ca000d7ea4a5922214f93cd1516e; version=fb176750266a3d7f42ebdcf28e8ba40350b27847 <9748f2f54f66743ac77275c34886a9f890e18409; version=fb176750266a3d7f42ebdcf28e8ba40350b27847 <cd04beb9ce2773a16057248bb4fa424068ae3807

Published CVSS scores

7.3Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8UbuntuCVSS: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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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