CVE-2026-80926 Linux Kernel ksmbd - Use After Free

Linux kernel ksmbd contains a use-after-free vulnerability caused by unsynchronized access to opinfo->conn in oplock break notification, letting authenticated clients with durable batch oplocks cause memory corruption, exploit requires authenticated client with durable batch oplock.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.44% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version containing the fix for ksmbd use-after-free in oplock break notification.

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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