Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-68154

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
10/08/2026
Last modified:
19/08/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> libceph: reject zero bucket types in crush_decode<br /> <br /> CRUSH bucket type 0 is reserved for devices. The mapper relies on<br /> that invariant and uses type 0 to identify leaf devices.<br /> <br /> If crush_decode() accepts a bucket with type 0, a malformed CRUSH map<br /> can make the mapper treat a negative bucket ID as a device and pass it<br /> to is_out(), which then indexes the OSD weight array with a negative<br /> value.<br /> <br /> Reject zero bucket types while decoding the CRUSH map so the invalid<br /> state never reaches the mapper.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
9.80
Severity 3.x
CRITICAL

References to Advisories, Solutions, and Tools