CVE-2025-68297

Kernel crash via uninitialized sparse-read cursor

Published Dec 16, 2025 · Updated Dec 16, 2025

Denial of service in Linux kernel CephFS allows local users to crash the kernel by reading an encrypted sparse file over secure msgr2. process_v2_sparse_read() reuses an uninitialized message-data cursor, leaving its data pointer null and residual length zero before advancing sparse-read data. The trigger requires a mounted CephFS using secure msgr2 and an fscrypt-encrypted directory, and the resulting fault interrupts the host.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel CephFS allows local users to crash the kernel by reading an encrypted sparse file over secure msgr2. process_v2_sparse_read() reuses an uninitialized message-data cursor, leaving its data pointer null and residual length zero before advancing sparse-read data. The trigger requires a mounted CephFS using secure msgr2 and an fscrypt-encrypted directory, and the resulting fault interrupts the host.

The record

CVE
CVE-2025-68297
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <43962db4a6f593903340c85591056a0cef812dfd
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47144748fbf12068ba4b82512098fe1ac748a2e9
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5a3f3e39b18705bc578fae58abacc8ef93c15194
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7d1b7de853f7d1eefd6d22949bcefc0c25186727

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <43962db4a6f593903340c85591056a0cef812dfd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47144748fbf12068ba4b82512098fe1ac748a2e9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5a3f3e39b18705bc578fae58abacc8ef93c15194; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7d1b7de853f7d1eefd6d22949bcefc0c25186727

Published CVSS scores

No CVSS assessment is available in this record.

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.

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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