Use of Uninitialized Variable in Linux kernel - CVE-2026-99114
Published: October 29, 2026
Vulnerability identifier: #VU158485
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99114
CWE-ID: CWE-457
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose residual response-buffer data.
The vulnerability exists due to an uninitialized FileSystemControlFlags field in the Linux kernel ksmbd smb2_get_info_filesystem() function when processing compound SMB requests. A remote user can send a specially crafted compound request that places an FS_CONTROL_INFORMATION response over data left by a discarded earlier response to disclose four bytes of residual response-buffer data.
Affected software
Linux kernel
How to mitigate CVE-2026-99114
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3