CVE-2025-68791

Service interruption via leaked FUSE payload-page references

Published Jan 13, 2026 · Updated Jan 13, 2026

Reference-count leakage in Linux Kernel 6.14 through 6.18.2 allows local users to interrupt service through FUSE io_uring argument copies. The FUSE io_uring copy path acquires payload-page references during argument copying but fails to call copy_finish, leaving those references unreleased. Exploitation requires low-privileged local access and repeated triggering of the high-complexity copy path, with availability impact only.

CVSS severity5.7
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reference-count leakage in Linux Kernel 6.14 through 6.18.2 allows local users to interrupt service through FUSE io_uring argument copies. The FUSE io_uring copy path acquires payload-page references during argument copying but fails to call copy_finish, leaving those references unreleased. Exploitation requires low-privileged local access and repeated triggering of the high-complexity copy path, with availability impact only.

The record

CVE
CVE-2025-68791
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.001
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?

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

  1. Affected versionversion=6.14
  2. Affected versionversion=c090c8abae4b6b77a1bee116aa6c385456ebef96 <6e0d7f7f4a43ac8868e98c87ecf48805aa8c24dd
  3. Affected versionversion=c090c8abae4b6b77a1bee116aa6c385456ebef96 <b79938863f436960eff209130f025c4bd3026bf8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.14; version=c090c8abae4b6b77a1bee116aa6c385456ebef96 <6e0d7f7f4a43ac8868e98c87ecf48805aa8c24dd; version=c090c8abae4b6b77a1bee116aa6c385456ebef96 <b79938863f436960eff209130f025c4bd3026bf8

Published CVSS scores

4.7SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.7SUSECVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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

T1499.001OS Exhaustion Flood

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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