CVE-2026-90169
In the Linux kernel, the following vulnerability has been resolved: ksmbd: free preauth sessions on connection teardown SMB3.1.1 multichannel binding preserves the preauthentication hash in a preauth_session between the NTLM negotiate and authenticate requests. The binding NTLM negotiate allocates this object and returns STATUS_MORE_PROCESSING_REQUIRED. If the client disconnects before it sends the authenticate request, neither the authenticate nor error cleanup paths free the object. Release any remaining preauthentication sessions when tearing down the connection. Initialize the list when allocating the connection so that this cleanup is safe regardless of the negotiated dialect.
Affected versions
Linux kernel versions
5.15
and later are affected. Fixed in
6.6.157,
6.12.110,
6.18.52,
7.2.6,
7.3-rc1
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-90169?
CVE-2026-90169 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.15 onward and has been patched in 6.6.157, 6.12.110, 6.18.52 and others. CVE-2026-90169 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-90169?
Yes. CVE-2026-90169 has been patched. Fixed versions include 6.6.157, 6.12.110, 6.18.52 and others. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-90169 actively exploited?
No. CVE-2026-90169 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.