CVE-2025-40233

Data exposure and corruption via stale extent cache

Published Dec 4, 2025 · Updated Aug 5, 2026

An OCFS2 extent-cache flaw in Linux allows local users to read or corrupt other files and wedge the mounted filesystem. After an extent move clears OCFS2_EXT_REFCOUNTED on disk, __ocfs2_move_extents_range() leaves the old flags and physical-cluster mapping cached for later I/O. A local user needs a writable regular file on a mounted OCFS2 volume; the sequence can expose or overwrite reallocated clusters, and the BUG_ON can block the filesystem or panic the system.

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

An OCFS2 extent-cache flaw in Linux allows local users to read or corrupt other files and wedge the mounted filesystem. After an extent move clears OCFS2_EXT_REFCOUNTED on disk, __ocfs2_move_extents_range() leaves the old flags and physical-cluster mapping cached for later I/O. A local user needs a writable regular file on a mounted OCFS2 volume; the sequence can expose or overwrite reallocated clusters, and the BUG_ON can block the filesystem or panic the system.

The record

CVE
CVE-2025-40233
Published
Dec 4, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 4, 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=3.0
  2. Affected versionversion=53069d4e76954e2e63c1b3c501051c6fbcf7298c <78a63493f8e352296dbc7cb7b3f4973105e8679e
  3. Affected versionversion=53069d4e76954e2e63c1b3c501051c6fbcf7298c <93166bc53c0e3587058327a4121daea34b4fecd5
  4. Affected versionversion=53069d4e76954e2e63c1b3c501051c6fbcf7298c <93b1ab422f1966b71561158e1aedce4ec100f357
  5. Affected versionversion=53069d4e76954e2e63c1b3c501051c6fbcf7298c <a21750df2f6169af6e039a3bb4893d6c9564e48d
  6. Affected versionversion=53069d4e76954e2e63c1b3c501051c6fbcf7298c <a7ee72286efba1d407c6f15a0528e43593fb7007
  7. Affected versionversion=53069d4e76954e2e63c1b3c501051c6fbcf7298c <aa6a21409dd6221bb268b56bb410e031c632ff9a
  8. Affected versionversion=53069d4e76954e2e63c1b3c501051c6fbcf7298c <bb69928ed578f881e68d26aaf1a8f6e7faab3b44
  9. Affected versionversion=53069d4e76954e2e63c1b3c501051c6fbcf7298c <e92af7737a94a729225d2a5d180eaaa77fe0bbc1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.0; version=53069d4e76954e2e63c1b3c501051c6fbcf7298c <78a63493f8e352296dbc7cb7b3f4973105e8679e; version=53069d4e76954e2e63c1b3c501051c6fbcf7298c <93166bc53c0e3587058327a4121daea34b4fecd5; version=53069d4e76954e2e63c1b3c501051c6fbcf7298c <93b1ab422f1966b71561158e1aedce4ec100f357; version=53069d4e76954e2e63c1b3c501051c6fbcf7298c <a21750df2f6169af6e039a3bb4893d6c9564e48d; version=53069d4e76954e2e63c1b3c501051c6fbcf7298c <a7ee72286efba1d407c6f15a0528e43593fb7007; version=53069d4e76954e2e63c1b3c501051c6fbcf7298c <aa6a21409dd6221bb268b56bb410e031c632ff9a; version=53069d4e76954e2e63c1b3c501051c6fbcf7298c <bb69928ed578f881e68d26aaf1a8f6e7faab3b44; version=53069d4e76954e2e63c1b3c501051c6fbcf7298c <e92af7737a94a729225d2a5d180eaaa77fe0bbc1

Published CVSS scores

7.8Linux kernel CVE teamCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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