Use-after-free in Linux kernel - CVE-2026-89788
Published: September 17, 2026
Vulnerability identifier: #VU150499
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89788
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise confidentiality, integrity, and availability.
The vulnerability exists due to a use-after-free in smb2_tree_connect() when processing concurrent SMB2 TREE_CONNECT and session logoff operations. A remote attacker can trigger a race between SMB2 TREE_CONNECT and session logoff operations to compromise confidentiality, integrity, and availability.
Affected software
Linux kernel
How to mitigate CVE-2026-89788
Install security update from vendor's repository.