CVE-2026-72367

Filesystem data corruption via io_size underflow

Published Aug 15, 2026 · Updated Aug 15, 2026

Integer underflow in the Linux kernel iomap subsystem allows local users to corrupt filesystem data during concurrent truncate and writeback. In iomap_writeback_handle_eof, an EOF below ioend->io_offset is subtracted and assigned to size_t io_size, wrapping it to a huge value. The race requires local file operations during writeback; the wrapped length can misdirect append detection and completion ranges, corrupting on-disk data.

CVSS severity8.8
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in the Linux kernel iomap subsystem allows local users to corrupt filesystem data during concurrent truncate and writeback. In iomap_writeback_handle_eof, an EOF below ioend->io_offset is subtracted and assigned to size_t io_size, wrapping it to a huge value. The race requires local file operations during writeback; the wrapped length can misdirect append detection and completion ranges, corrupting on-disk data.

The record

CVE
CVE-2026-72367
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-191, T1485
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=51d20d1dacbec589d459e11fc88fbca419f84a99 <1f38f65bf965fce9aa159d45c5347538f56c5973
  2. Affected versionversion=51d20d1dacbec589d459e11fc88fbca419f84a99 <55ec50d046c03b3724741957f7b007856e36dbe7
  3. Affected versionversion=51d20d1dacbec589d459e11fc88fbca419f84a99 <7f7780abb4c0fdc9a2603aea8e985ff14ee900e0
  4. Affected versionversion=6.12.10 <6.13
  5. Affected versionversion=6.13
  6. Affected versionversion=82c59a86a247a8970d353d10f52a37e5564fb137

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=51d20d1dacbec589d459e11fc88fbca419f84a99 <1f38f65bf965fce9aa159d45c5347538f56c5973; version=51d20d1dacbec589d459e11fc88fbca419f84a99 <55ec50d046c03b3724741957f7b007856e36dbe7; version=51d20d1dacbec589d459e11fc88fbca419f84a99 <7f7780abb4c0fdc9a2603aea8e985ff14ee900e0; version=6.12.10 <6.13; version=6.13; version=82c59a86a247a8970d353d10f52a37e5564fb137

Published CVSS scores

8.8Linux CNA via cve.orgCVSS:3.1/AV:N/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 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

CWE-191Integer Underflow (Wrap or Wraparound)
T1485Data Destruction

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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