Integer overflow in Linux kernel - CVE-2026-89665
Published: September 12, 2026
Vulnerability identifier: #VU149147
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-2026-89665
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause improper filesystem timestamp handling.
The vulnerability exists due to an integer overflow in the NFSv2 sattr decoder in svcxdr_decode_sattr() when decoding NFSv2 SETATTR or CREATE time attributes. A remote attacker can send a crafted NFSv2 request containing an out-of-range useconds value to cause improper filesystem timestamp handling.
The overflow affects 32-bit ILP32 platforms.
Affected software
Linux kernel
How to mitigate CVE-2026-89665
Install security update from vendor's repository.