Missing Authorization in Linux kernel - CVE-2026-89694
Published: September 12, 2026
Vulnerability identifier: #VU149111
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89694
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper access control in the NFS server copy-notify state management function when processing OFFLOAD_CANCEL requests. A remote user can send an OFFLOAD_CANCEL request for another client's copy-notify stateid to cause a denial of service.
Copy-notify stateid object identifiers are allocated cyclically and are guessable.
Affected software
Linux kernel
How to mitigate CVE-2026-89694
Install security update from vendor's repository.