Improper Handling of Length Parameter Inconsistency in Linux kernel - CVE-2026-89673
Published: September 12, 2026
Vulnerability identifier: #VU149139
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89673
CWE-ID: CWE-130
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose stale reply-page content.
The vulnerability exists due to an incorrect XDR padding calculation in nfsd4_ff_encode_getdeviceinfo() when encoding flexfile GETDEVICEINFO replies. A remote attacker can send a GETDEVICEINFO request to disclose stale reply-page content.
The incorrect declared address-body length can also mis-align decoding of the subsequent version list.
Affected software
Linux kernel
How to mitigate CVE-2026-89673
Install security update from vendor's repository.