CVE-2025-68285Network attack vector

Remote kernel compromise via unlocked map replacement

Published Dec 16, 2025 · Updated Dec 16, 2025

Use-after-free in Linux libceph allows remote attackers controlling a Ceph monitor to corrupt kernel memory via map updates. The have_mon_and_osd_map() wait condition reads monmap and osdmap epoch fields without their locks while handlers can free and replace either map. A configured CephFS or RBD session must connect to the malicious monitor; exploitation can disclose or corrupt kernel memory or crash the host.

CVSS severity9.8
Critical
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux libceph allows remote attackers controlling a Ceph monitor to corrupt kernel memory via map updates. The have_mon_and_osd_map() wait condition reads monmap and osdmap epoch fields without their locks while handlers can free and replace either map. A configured CephFS or RBD session must connect to the malicious monitor; exploitation can disclose or corrupt kernel memory or crash the host.

The record

CVE
CVE-2025-68285
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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

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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 <05ec43e9a9de67132dc8cd3b22afef001574947f
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <076381c261374c587700b3accf410bdd2dba334e
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <183ad6e3b651e8fb0b66d6a2678f4b80bfbba092
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3fc43120b22a3d4f1fbeff56a35ce2105b6a5683
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c8ccdc1714d9fabecd26e1be7db1771061acc6e
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bb4910c5fd436701faf367e1b5476a5a6d2aff1c
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e08021b3b56b2407f37b5fe47b654be80cc665fb

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <05ec43e9a9de67132dc8cd3b22afef001574947f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <076381c261374c587700b3accf410bdd2dba334e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <183ad6e3b651e8fb0b66d6a2678f4b80bfbba092; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3fc43120b22a3d4f1fbeff56a35ce2105b6a5683; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c8ccdc1714d9fabecd26e1be7db1771061acc6e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bb4910c5fd436701faf367e1b5476a5a6d2aff1c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e08021b3b56b2407f37b5fe47b654be80cc665fb

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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

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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