SB20260626151 - Improper access control in Linux kernel infiniband core driver
Published: June 26, 2026
Security Bulletin ID
SB20260626151
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-53188)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to bypass device type validation.
The vulnerability exists due to improper access control in ib_get_ucaps() when handling a file descriptor for a device with a matching dev_t value. A local user can supply a file descriptor for a block device that masquerades as a ucap cdev to bypass device type validation.
The issue arises because relying only on dev_t is unsafe due to char/block aliasing.
Remediation
Install update from vendor's website.