SB20260812386 - Out-of-bounds read in Linux kernel ceph

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Main Vulnerability Database SB20260812386

SB20260812386 - Out-of-bounds read in Linux kernel ceph

Published: August 12, 2026

Security Bulletin ID SB20260812386
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-68154)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in crush_decode and the CRUSH mapper when parsing a malformed CRUSH map. A local user can supply a crafted CRUSH map with a zero bucket type to cause a denial of service.

The issue arises because bucket type 0 is reserved for devices, and an invalid map can make the mapper treat a negative bucket ID as a device and index the OSD weight array with a negative value.


Remediation

Install update from vendor's website.

References