CVE-2025-68794

Local denial of service via iomap range underflow

Published Jan 13, 2026 · Updated Jan 13, 2026

Range calculation error in the Linux Kernel allows local users to cause a denial of service through non-block-aligned EROFS reads. iomap_adjust_read_range() skips too many bytes because it assumes block-aligned positions; when all blocks are uptodate, the length underflows and the returned position lies beyond the folio. The path requires local low-privileged access and the all-uptodate block condition, with the published impact limited to availability.

CVSS severity5.5
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Range calculation error in the Linux Kernel allows local users to cause a denial of service through non-block-aligned EROFS reads. iomap_adjust_read_range() skips too many bytes because it assumes block-aligned positions; when all blocks are uptodate, the length underflows and the returned position lies beyond the folio. The path requires local low-privileged access and the all-uptodate block condition, with the published impact limited to availability.

The record

CVE
CVE-2025-68794
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 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?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <142194fb21afe964d2d194cab1fc357cbf87e899
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7aa6bc3e8766990824f66ca76c19596ce10daf3e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <82b60ffbb532d919959702768dca04c3c0500ae5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <142194fb21afe964d2d194cab1fc357cbf87e899; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7aa6bc3e8766990824f66ca76c19596ce10daf3e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <82b60ffbb532d919959702768dca04c3c0500ae5

Published CVSS scores

5.5LinuxCVSS: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

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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