CVE-2025-68251

System hang via unchecked EROFS compact index

Published Dec 16, 2025 · Updated Dec 16, 2025

Denial of service in affected Linux kernels allows local users to hang the system by accessing a crafted compressed EROFS image. The z_erofs_load_lcluster_from_disk() path in fs/erofs/zmap.c fails to reject a clusterofs value larger than lclustersize for a non-head logical cluster in a corrupted subpage compact index, so mapping can repeat without advancing. Reaching the flaw requires the kernel to process that malformed index; the observed consequence is an infinite loop and service hang.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in affected Linux kernels allows local users to hang the system by accessing a crafted compressed EROFS image. The z_erofs_load_lcluster_from_disk() path in fs/erofs/zmap.c fails to reject a clusterofs value larger than lclustersize for a non-head logical cluster in a corrupted subpage compact index, so mapping can repeat without advancing. Reaching the flaw requires the kernel to process that malformed index; the observed consequence is an infinite loop and service hang.

The record

CVE
CVE-2025-68251
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=22438a34d383ec2789eaf450728e38abc53051f8
  2. Affected versionversion=3f691aa676f29586e83e6c032713554a290418c3
  3. Affected versionversion=6.8
  4. Affected versionversion=8d2517aaeea3ab8651bb517bca8f3c8664d318ea <8675447a8794983f2b7e694b378112772c17635e
  5. Affected versionversion=8d2517aaeea3ab8651bb517bca8f3c8664d318ea <e13d315ae077bb7c3c6027cc292401bc0f4ec683

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=22438a34d383ec2789eaf450728e38abc53051f8; version=3f691aa676f29586e83e6c032713554a290418c3; version=6.8; version=8d2517aaeea3ab8651bb517bca8f3c8664d318ea <8675447a8794983f2b7e694b378112772c17635e; version=8d2517aaeea3ab8651bb517bca8f3c8664d318ea <e13d315ae077bb7c3c6027cc292401bc0f4ec683

Published CVSS scores

5.5SUSECVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo