SB20260812388 - Use-after-free in Linux kernel ceph

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Main Vulnerability Database SB20260812388

SB20260812388 - Use-after-free in Linux kernel ceph

Published: August 12, 2026

Security Bulletin ID SB20260812388
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) Use-after-free (CVE-ID: CVE-2026-68156)

CWE-ID: CWE-416 - Use After Free

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 use-after-free in the Ceph authorizer handling code when processing a rebuilt authorizer during a messenger reconnect. A local user can trigger an authorizer update that reallocates the buffer and then cause a reconnect to use a stale pointer to cause a denial of service.

The issue is triggered when a newer service ticket causes the authorizer to be rebuilt and the rebuilt authorizer no longer fits in the existing buffer.


Remediation

Install update from vendor's website.

References