SB20260912283 - Use of Uninitialized Variable in Linux kernel infiniband core driver
Published: September 12, 2026
Security Bulletin ID
SB20260912283
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use of Uninitialized Variable (CVE-ID: CVE-2026-89505)
CWE-ID: CWE-457 - Use of Uninitialized Variable
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 of an uninitialized pointer in uverbs_get_handler_fn() when processing malformed provider input through the legacy write() path. A local user can supply malformed provider input to trigger the pointer dereference and cause a denial of service.
Remediation
Install update from vendor's website.