Use-after-free in Linux kernel - CVE-2026-89708
Published: September 12, 2026
Vulnerability identifier: #VU149091
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89708
CWE-ID: CWE-416
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 use-after-free in the NFS server callback session handling when terminating an NFSv4 session while a callback RPC task remains in flight. A remote user can send a DESTROY_SESSION request while a callback RPC task remains in flight to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89708
Install security update from vendor's repository.