CVE-2026-90162 Linux kernel ksmbd - Use-After-Free

Linux kernel ksmbd contains a use-after-free and double-free race condition caused by premature publishing of granted locks in smb2_lock(), letting concurrent attackers cause memory corruption, exploit requires concurrent SMB2_LOCK and UNLOCK requests.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.57% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use-After-Free
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for deferred lock publishing.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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