CVE-2025-39868

Kernel panic via uncleared EROFS DAX entries

Published Sep 23, 2025 · Updated Sep 23, 2025

Kernel-state corruption in Linux 6.15 through 6.16.7 and 6.17-rc1 through 6.17-rc3 allows local users to panic the kernel via EROFS inode eviction. The EROFS shutdown path fails to wait for DAX pages to become idle before generic_shutdown_super removes mappings whose pages remain pinned or busy. Reachability requires read access to an already mounted dax=always EROFS filesystem; eviction can corrupt page and refcount state, disclose recycled persistent-memory data, or crash the host.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Kernel-state corruption in Linux 6.15 through 6.16.7 and 6.17-rc1 through 6.17-rc3 allows local users to panic the kernel via EROFS inode eviction. The EROFS shutdown path fails to wait for DAX pages to become idle before generic_shutdown_super removes mappings whose pages remain pinned or busy. Reachability requires read access to an already mounted dax=always EROFS filesystem; eviction can corrupt page and refcount state, disclose recycled persistent-memory data, or crash the host.

The record

CVE
CVE-2025-39868
Published
Sep 23, 2025
Updated
Sep 23, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2025Record 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=6.15
  2. Affected versionversion=bde708f1a65d025c45575bfe1e7bf7bdf7e71e87 <181993bb0d626cf88cc803f4356ce5c5abe86278
  3. Affected versionversion=bde708f1a65d025c45575bfe1e7bf7bdf7e71e87 <91c34cd6ca1bc67ccf2d104834956af56b5893de

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.15; version=bde708f1a65d025c45575bfe1e7bf7bdf7e71e87 <181993bb0d626cf88cc803f4356ce5c5abe86278; version=bde708f1a65d025c45575bfe1e7bf7bdf7e71e87 <91c34cd6ca1bc67ccf2d104834956af56b5893de

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS: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

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

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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