CVE-2025-68240

Service interruption via active timer teardown

Published Dec 16, 2025 · Updated Dec 16, 2025

A timer lifetime flaw in Linux kernel NILFS2 6.12 allows local users to interrupt the system during log-writer teardown. nilfs_segctor_destroy() frees segment-constructor state after kthread_stop() returns -EINTR without synchronously shutting down sc_timer, leaving the timer active against freed state. The published assessment requires low-privileged local access; the reported impact is limited to availability, with no data disclosure or modification.

CVSS severity5.5
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

A timer lifetime flaw in Linux kernel NILFS2 6.12 allows local users to interrupt the system during log-writer teardown. nilfs_segctor_destroy() frees segment-constructor state after kthread_stop() returns -EINTR without synchronously shutting down sc_timer, leaving the timer active against freed state. The published assessment requires low-privileged local access; the reported impact is limited to availability, with no data disclosure or modification.

The record

CVE
CVE-2025-68240
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

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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=3f66cc261ccb54a8e4d8d5aa51c389c19453b00c <2f65799e2a736d556d306440c4e1e8906736117a
  2. Affected versionversion=3f66cc261ccb54a8e4d8d5aa51c389c19453b00c <36049e81dc7f077e0e24d5b9688a7458beacef8f
  3. Affected versionversion=3f66cc261ccb54a8e4d8d5aa51c389c19453b00c <9a6b60cb147d53968753a34805211d2e5e08c027
  4. Affected versionversion=6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3f66cc261ccb54a8e4d8d5aa51c389c19453b00c <2f65799e2a736d556d306440c4e1e8906736117a; version=3f66cc261ccb54a8e4d8d5aa51c389c19453b00c <36049e81dc7f077e0e24d5b9688a7458beacef8f; version=3f66cc261ccb54a8e4d8d5aa51c389c19453b00c <9a6b60cb147d53968753a34805211d2e5e08c027; version=6.12

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.

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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.

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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