Use-after-free in Linux kernel - CVE-2026-89545
Published: September 12, 2026
Vulnerability identifier: #VU149264
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89545
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a use-after-free.
The vulnerability exists due to improper RCU synchronization in the SunRPC service request cleanup routine when RCU readers traverse the thread list after a service request is removed. A local user can cause RCU readers to dereference freed request argument memory to trigger a use-after-free.
The issue affects request data accessed by readers such as nfsd_nl_rpc_status_get_dumpit().
Affected software
Linux kernel
How to mitigate CVE-2026-89545
Install security update from vendor's repository.