Use of Uninitialized Variable in Linux kernel - CVE-2026-89765
Published: September 12, 2026
Vulnerability identifier: #VU149039
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89765
CWE-ID: CWE-457
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose uninitialized kernel stack memory.
The vulnerability exists due to use of uninitialized memory in put_itimerval() when calling getitimer() on native sparc64 systems. A remote attacker can invoke getitimer() to disclose uninitialized kernel stack memory.
Affected software
Linux kernel
How to mitigate CVE-2026-89765
Install security update from vendor's repository.