Race condition in Linux kernel - CVE-2026-89684
Published: September 12, 2026
Vulnerability identifier: #VU149118
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89684
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a race condition in the NFS server copy-notification state handling when processing concurrent NFSv4.2 OFFLOAD_CANCEL requests. A remote attacker can send racing OFFLOAD_CANCEL requests to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89684
Install security update from vendor's repository.