Uncontrolled Recursion in Linux kernel - CVE-2026-46256
Published: June 4, 2026
Vulnerability identifier: #VU133334
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-46256
CWE-ID: CWE-674
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in NFS LOCALIO when triggering direct reclaim recursion into NFS via nfs_writepages. A local user can perform local NFS LOCALIO write or commit operations to cause a denial of service.
The issue occurs in loopback mount configurations where the NFS client and server are on the same system.
How to mitigate CVE-2026-46256
Install security update from vendor's repository.