Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-89683
Published: September 12, 2026
Vulnerability identifier: #VU149117
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89683
CWE-ID: CWE-772
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to consume system resources.
The vulnerability exists due to missing release of a resource in nfsd_set_fh_dentry() when processing crafted NFSv3 filehandles targeting a V4ROOT export's fsid. A remote attacker can send a crafted NFSv3 filehandle to consume system resources.
The dentry reference leak is triggered on every request.
Affected software
Linux kernel
How to mitigate CVE-2026-89683
Install security update from vendor's repository.