#VU124884 Use-after-free in Linux kernel - CVE-2026-31404
Published: April 6, 2026
Vulnerability identifier: #VU124884
Vulnerability risk: Low
CVSSv4.0: 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-2026-31404
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to a use-after-free in NFSD export cache object cleanup when accessing export information through RCU readers concurrently with cache entry removal. A local attacker can trigger concurrent export cache cleanup and access to freed sub-objects to cause a denial of service.
The issue can result in a NULL pointer dereference in d_path when ex_path or ex_client->name related sub-objects are freed before the RCU grace period completes.
Remediation
Install security update from vendor's repository.