Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-89707
Published: September 12, 2026
Vulnerability identifier: #VU149090
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89707
CWE-ID: CWE-772
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 resource release in nfsd_cross_mnt() when handling NFS requests that result in follow_down() errors. A remote user can send NFS requests that trigger failed cross-mount operations to cause a denial of service.
The issue is reachable through nfsd_lookup_dentry or NFSv4 READDIR encoding.
Affected software
Linux kernel
How to mitigate CVE-2026-89707
Install security update from vendor's repository.