CVE-2026-72164

Local file disclosure and corruption via occupied extent

Published Aug 15, 2026 · Updated Aug 15, 2026

Improper allocation handling in affected Linux OCFS2 kernels allows local users to corrupt or disclose file data through an extent-move ioctl. ocfs2_probe_alloc_group() can preserve an occupied caller-controlled goal or return the bit before a free run, so __ocfs2_move_extent() copies into a cluster owned by another inode. Write access to a regular file on a mounted OCFS2 volume is sufficient to cause cross-file block aliasing, filesystem errors, or a panic.

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

What happened

Improper allocation handling in affected Linux OCFS2 kernels allows local users to corrupt or disclose file data through an extent-move ioctl. ocfs2_probe_alloc_group() can preserve an occupied caller-controlled goal or return the bit before a free run, so __ocfs2_move_extent() copies into a cluster owned by another inode. Write access to a regular file on a mounted OCFS2 volume is sufficient to cause cross-file block aliasing, filesystem errors, or a panic.

The record

CVE
CVE-2026-72164
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e
  3. Affected versionversion=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <19f7b04924b20b81dabbeed19d5542792ba5b6d6
  4. Affected versionversion=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <22920541c35a9f23f219038ba5874c843a7c4419
  5. Affected versionversion=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <3112afebf2a76e522fbaabcbb0c47aafbdc35932
  6. Affected versionversion=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <35486b291b8fbde6c4d0b1c79e565c6260d3329d
  7. Affected versionversion=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <4d1953d3aeb4a7f6623083e1839068ee1c157db2
  8. Affected versionversion=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <d5d5a21fb33cd9b963aea99da81e4dacd452cd95
  9. Affected versionversion=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <e281d892ce5870a50fdc718cb3bfc3dd5b62c728

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.0; version=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e; version=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <19f7b04924b20b81dabbeed19d5542792ba5b6d6; version=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <22920541c35a9f23f219038ba5874c843a7c4419; version=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <3112afebf2a76e522fbaabcbb0c47aafbdc35932; version=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <35486b291b8fbde6c4d0b1c79e565c6260d3329d; version=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <4d1953d3aeb4a7f6623083e1839068ee1c157db2; version=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <d5d5a21fb33cd9b963aea99da81e4dacd452cd95; version=e6b5859cccfa0fec02f3c5b1069481efc7186f47 <e281d892ce5870a50fdc718cb3bfc3dd5b62c728

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1565.001Data Manipulation: Stored Data Manipulation

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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