CVE-2025-40167Public exploit

Kernel panic via unvalidated conflicting inode flags

Published Nov 12, 2025 · Updated Aug 5, 2026

Improper ext4 inode validation in the Linux kernel allows attackers to crash the host through a crafted local filesystem image. ext4_has_inline_data() accepts an inode bearing both INLINE_DATA and EXTENTS, so __ext4_iget() skips extent-tree validation and out-of-order extents underflow the hole-size calculation in ext4_es_cache_extent(), triggering BUG_ON. The image must be mounted without a journal and the crafted verity file opened; a user or automounter must perform the mount and access.

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

Improper ext4 inode validation in the Linux kernel allows attackers to crash the host through a crafted local filesystem image. ext4_has_inline_data() accepts an inode bearing both INLINE_DATA and EXTENTS, so __ext4_iget() skips extent-tree validation and out-of-order extents underflow the hole-size calculation in ext4_es_cache_extent(), triggering BUG_ON. The image must be mounted without a journal and the crafted verity file opened; a user or automounter must perform the mount and access.

The record

CVE
CVE-2025-40167
Published
Nov 12, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 12, 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=3.8
  2. Affected versionversion=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <1437c95ab2a28b138d4521653583729f61ccb48b
  3. Affected versionversion=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <1d3ad183943b38eec2acf72a0ae98e635dc8456b
  4. Affected versionversion=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <1f5ccd22ff482639133f2a0fe08f6d19d0e68717
  5. Affected versionversion=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <2e9e10657b04152ed0d6ecae8d0c02a3405e28f5
  6. Affected versionversion=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <4954d297c91d292630ab43ba4d195dc371ce65d3
  7. Affected versionversion=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <cb6039b68efa547b676a8a10fc4618d9d1865c23
  8. Affected versionversion=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <de985264eef64be8a90595908f2e6a87946dad34
  9. Affected versionversion=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <f061f7c331fc16250fc82aa68964f35821687217

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.8; version=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <1437c95ab2a28b138d4521653583729f61ccb48b; version=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <1d3ad183943b38eec2acf72a0ae98e635dc8456b; version=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <1f5ccd22ff482639133f2a0fe08f6d19d0e68717; version=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <2e9e10657b04152ed0d6ecae8d0c02a3405e28f5; version=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <4954d297c91d292630ab43ba4d195dc371ce65d3; version=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <cb6039b68efa547b676a8a10fc4618d9d1865c23; version=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <de985264eef64be8a90595908f2e6a87946dad34; version=f19d5870cbf72d4cb2a8e1f749dff97af99b071e <f061f7c331fc16250fc82aa68964f35821687217

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

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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