CVE-2026-90169
kernel: ksmbd: free preauth sessions on connection teardown
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 17, 2026
Updated · October 21, 2026
Description
A flaw was found in ksmbd within the Linux kernel. A remote attacker could exploit this vulnerability by initiating an SMB3.1.1 multichannel binding connection and then disconnecting after the NTLM negotiate request but before the authenticate request. This failure to properly free preauthentication session objects leads to a memory leak, which could result in a Denial of Service (DoS) condition for the ksmbd server.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-772 · Missing Release of Resource after Effective Lifetime