Use-after-free in Linux kernel - CVE-2026-99277
Published: November 8, 2026
Vulnerability identifier: #VU161880
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99277
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to potentially cause a denial of service through a kernel use-after-free.
The vulnerability exists due to use-after-free in ksmbd session channel management when session unregistration and connection cleanup occur concurrently with access through a surviving session reference. A remote user can trigger concurrent SMB session and connection operations to potentially cause a kernel crash by accessing a channel's freed connection object.
Affected software
Linux kernel
How to mitigate CVE-2026-99277
Install security update from vendor's repository.