SB2026062306 - Improper access control in Linux kernel rdma

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026062306

SB2026062306 - Improper access control in Linux kernel rdma

Published: June 23, 2026

Security Bulletin ID SB2026062306
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-52908)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to gain write access to memory regions that were not properly pinned as writable.

The vulnerability exists due to improper access control in RDMA memory region re-registration handling when changing IB_MR_REREG_ACCESS from read-only to read-write. A local user can re-register a memory region with writable access to gain write access to memory regions that were not properly pinned as writable.

The issue occurs when a driver reuses an existing umem during memory region re-registration.


Remediation

Install update from vendor's website.

References