CVE-2025-68284Network attack vector

Kernel memory corruption via unchecked authentication lengths

Published Dec 16, 2025 · Updated Dec 16, 2025

Out-of-bounds write in Linux libceph allows remote attackers to corrupt kernel memory through a crafted CephX authentication reply. handle_auth_session_key() trusts packet-supplied connection-secret and service-ticket lengths and passes unchecked spans to decryption and ticket processing. A malicious or compromised configured Ceph monitor can trigger the flaw during an automatic client exchange, causing a kernel crash or enabling kernel code execution.

CVSS severity9.8
Critical
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux libceph allows remote attackers to corrupt kernel memory through a crafted CephX authentication reply. handle_auth_session_key() trusts packet-supplied connection-secret and service-ticket lengths and passes unchecked spans to decryption and ticket processing. A malicious or compromised configured Ceph monitor can trigger the flaw during an automatic client exchange, causing a kernel crash or enabling kernel code execution.

The record

CVE
CVE-2025-68284
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ef575834ca99f719d7573cdece9df2fe2b72424
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6920ff09bf911bc919cd7a6b7176fbdd1a6e6850
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7fce830ecd0a0256590ee37eb65a39cbad3d64fc
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8dfcc56af28cffb8f25fb9be37b3acc61f2a3d09
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ccbccfba25e9aa395daaea156b5e7790910054c4
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f22c55a20a2d9ffbbac57408d5d488cef8201e9d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ef575834ca99f719d7573cdece9df2fe2b72424; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6920ff09bf911bc919cd7a6b7176fbdd1a6e6850; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7fce830ecd0a0256590ee37eb65a39cbad3d64fc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8dfcc56af28cffb8f25fb9be37b3acc61f2a3d09; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ccbccfba25e9aa395daaea156b5e7790910054c4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f22c55a20a2d9ffbbac57408d5d488cef8201e9d

Published CVSS scores

9.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5OracleCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

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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