Use of Uninitialized Variable in Linux kernel - CVE-2026-89505
Published: September 12, 2026
Vulnerability identifier: #VU149305
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89505
CWE-ID: CWE-457
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89505
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3