Use of Uninitialized Variable in Linux kernel - CVE-2026-80927
Published: September 13, 2026
Vulnerability identifier: #VU149465
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80927
CWE-ID: CWE-457
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose uninitialized stack data to userspace.
The vulnerability exists due to use of an uninitialized variable in __do_adjtimex() when the auxiliary clock is disabled during tk_get_aux_ts64() and enabled before clock validity is checked. A local user can invoke adjtimex during this race to disclose uninitialized stack data to userspace.
Affected software
Linux kernel
How to mitigate CVE-2026-80927
Install security update from vendor's repository.