CVE-2025-68351

Service interruption via exFAT refcount leak

Published Dec 24, 2025 · Updated Dec 24, 2025

Reference-count leakage in Linux 6.12.23 through 6.12.67 and 6.13.11 through 6.18.1 allows local users to exhaust kernel memory. In fs/exfat/namei.c, exfat_find returns through two checks after exfat_get_dentry_set increments es->bh without calling exfat_put_dentry_set. Low-privilege access to affected exFAT lookup paths is required; repeated triggering leaks buffer-head references and can interrupt system availability.

CVSS severity5.5
Medium
EPSS probability0.17%
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 6.12.23 through 6.12.67 and 6.13.11 through 6.18.1 allows local users to exhaust kernel memory. In fs/exfat/namei.c, exfat_find returns through two checks after exfat_get_dentry_set increments es->bh without calling exfat_put_dentry_set. Low-privilege access to affected exFAT lookup paths is required; repeated triggering leaks buffer-head references and can interrupt system availability.

The record

CVE
CVE-2025-68351
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.001
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=0c8a1d2afd0dce0ea9257ab8c2271d8db6cb575d
  2. Affected versionversion=13940cef95491472760ca261b6713692ece9b946 <9aee8de970f18c2aaaa348e3de86c38e2d956c1d
  3. Affected versionversion=13940cef95491472760ca261b6713692ece9b946 <d009ff8959d28d2a33aeb96a5f7e7161c421d78f
  4. Affected versionversion=6.14
  5. Affected versionversion=6c627bcc1896ba62ec793d0c00da74f3c93ce3ad
  6. Affected versionversion=92075758782c5edb4c67d0da9e47586a624c22f7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0c8a1d2afd0dce0ea9257ab8c2271d8db6cb575d; version=13940cef95491472760ca261b6713692ece9b946 <9aee8de970f18c2aaaa348e3de86c38e2d956c1d; version=13940cef95491472760ca261b6713692ece9b946 <d009ff8959d28d2a33aeb96a5f7e7161c421d78f; version=6.14; version=6c627bcc1896ba62ec793d0c00da74f3c93ce3ad; version=92075758782c5edb4c67d0da9e47586a624c22f7

Published CVSS scores

5.5NIST NVDCVSS: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

T1499.001OS Exhaustion Flood

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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