Improper control of a resource through its lifetime in Linux kernel - CVE-2026-89697
Published: September 12, 2026
Vulnerability identifier: #VU149114
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89697
CWE-ID: CWE-664
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a SETATTR operation without a mount write reference.
The vulnerability exists due to missing mount write reference acquisition in nfsd_proc_setattr() when processing a SETATTR request in the BOTH_TIME_SET branch. A remote attacker can submit a SETATTR request with both time attributes set to perform a SETATTR operation without a mount write reference.
Affected software
Linux kernel
How to mitigate CVE-2026-89697
Install security update from vendor's repository.