Use of uninitialized resource in Linux kernel - CVE-2026-99115
Published: October 29, 2026
Vulnerability identifier: #VU158469
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-2026-99115
CWE-ID: CWE-908
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose residual response-buffer data from the Linux kernel SMB server.
The vulnerability exists due to an uninitialized FileSysIdentifier field in ksmbd's smb2_get_info_filesystem() function when processing compound SMB requests for FS_POSIX_INFORMATION. A remote user can submit a compound request in which an earlier reply is replaced by a shorter error response, leaving residual data that the subsequent filesystem-information reply can disclose through the eight-byte field.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99115
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.115-2
linux (Debian package) - update to 6.12.115-2