CVE-2026-68154Network attack vector

Kernel memory corruption via CRUSH map decoding

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds access in Linux libceph allows remote attackers to corrupt kernel memory through a malformed CRUSH map from a Ceph peer. crush_decode() accepts reserved bucket type 0, causing the mapper to treat a negative bucket ID as a device and pass it to is_out(), which indexes the OSD weight array negatively. The target must run the in-kernel Ceph client and accept a map from a controlled, compromised, or man-in-the-middle Ceph monitor or OSD; consequences include memory disclosure, corruption, code execution, or a kernel panic.

CVSS severity9.8
Critical
EPSS probability0.70%
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 access in Linux libceph allows remote attackers to corrupt kernel memory through a malformed CRUSH map from a Ceph peer. crush_decode() accepts reserved bucket type 0, causing the mapper to treat a negative bucket ID as a device and pass it to is_out(), which indexes the OSD weight array negatively. The target must run the in-kernel Ceph client and accept a map from a controlled, compromised, or man-in-the-middle Ceph monitor or OSD; consequences include memory disclosure, corruption, code execution, or a kernel panic.

The record

CVE
CVE-2026-68154
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record 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=2.6.34
  2. Affected versionversion=f24e9980eb860d8600cbe5ef3d2fd9295320d229 <05f90284223381005d6bcddab3fda4a97f9c3401
  3. Affected versionversion=f24e9980eb860d8600cbe5ef3d2fd9295320d229 <3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56
  4. Affected versionversion=f24e9980eb860d8600cbe5ef3d2fd9295320d229 <70998f91030ee083ecb336a1dff0701c20a38081
  5. Affected versionversion=f24e9980eb860d8600cbe5ef3d2fd9295320d229 <826cd1de5802fd392922785f9b64d76e65d2a100
  6. Affected versionversion=f24e9980eb860d8600cbe5ef3d2fd9295320d229 <b8a9fb6bf806f9c4891e71ae1beab0c07c23a877

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=f24e9980eb860d8600cbe5ef3d2fd9295320d229 <05f90284223381005d6bcddab3fda4a97f9c3401; version=f24e9980eb860d8600cbe5ef3d2fd9295320d229 <3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56; version=f24e9980eb860d8600cbe5ef3d2fd9295320d229 <70998f91030ee083ecb336a1dff0701c20a38081; version=f24e9980eb860d8600cbe5ef3d2fd9295320d229 <826cd1de5802fd392922785f9b64d76e65d2a100; version=f24e9980eb860d8600cbe5ef3d2fd9295320d229 <b8a9fb6bf806f9c4891e71ae1beab0c07c23a877

Published CVSS scores

7.0OracleCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8Linux Kernel CVE TeamCVSS: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

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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