Use-after-free in Linux kernel - CVE-2026-98175
Published: October 7, 2026
Vulnerability identifier: #VU153843
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98175
CWE-ID: CWE-416
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-after-free in the SMB client clean_demultiplex_info() function when the demultiplex thread exits while server reconnect work remains queued. A local user can trigger this cleanup sequence to cause a denial of service.
The queued smb2_reconnect_server() work subsequently reads the srv_count field of the freed server structure.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-98175
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.113-1
linux (Debian package) - update to 6.12.113-1
External References
- https://git.kernel.org/stable/c/180380272f116dbd2b0354c5c7872e112e519149
- https://git.kernel.org/stable/c/2e5103e11a17c274715dd56cf185eeedccf686b8
- https://git.kernel.org/stable/c/7ab9ceedd860216fb97f2d8574cbe58b8906f42a
- https://git.kernel.org/stable/c/c65eae6f61d1778ff7a82e4aae4080e26f486af1
- https://git.kernel.org/stable/c/e3f6a779433d13aafb5edab59e4f9313051e8a52