CVE-2025-68350

System crash via zero readahead modulus

Published Dec 24, 2025 · Updated Dec 24, 2025

Divide-by-zero in the exFAT allocation bitmap code in Linux 6.18 allows local users to crash the system via exFAT bitmap allocation. In exfat_allocate_bitmap(), max_ra_count can be zero when readahead is disabled, yet the allocation loop evaluates i % max_ra_count. Local low-privileged access is required to exercise the affected exFAT path, and successful exploitation interrupts availability by crashing the kernel.

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

Divide-by-zero in the exFAT allocation bitmap code in Linux 6.18 allows local users to crash the system via exFAT bitmap allocation. In exfat_allocate_bitmap(), max_ra_count can be zero when readahead is disabled, yet the allocation loop evaluates i % max_ra_count. Local low-privileged access is required to exercise the affected exFAT path, and successful exploitation interrupts availability by crashing the kernel.

The record

CVE
CVE-2025-68350
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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=6.18
  2. Affected versionversion=9fd688678dd86e3be32a35e3b2c5cc3ef0c4e257 <88fc3dd6e631b3e2975f898c6c2b6bc6f7058b44
  3. Affected versionversion=9fd688678dd86e3be32a35e3b2c5cc3ef0c4e257 <d70a5804c563b5e34825353ba9927509df709651

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.18; version=9fd688678dd86e3be32a35e3b2c5cc3ef0c4e257 <88fc3dd6e631b3e2975f898c6c2b6bc6f7058b44; version=9fd688678dd86e3be32a35e3b2c5cc3ef0c4e257 <d70a5804c563b5e34825353ba9927509df709651

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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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