Updated: 2023-03-08 19:07:14.638971


The Linux kernel NFSD implementation prior to versions 5.19.17 and 6.0.2 are vulnerable to buffer overflow. NFSD tracks the number of pages held by each NFSD thread by combining the receive and send buffers of a remote procedure call (RPC) into a single array of pages. A client can force the send buffer to shrink by sending an RPC message over TCP with garbage data added at the end of the message. The RPC message with garbage data is still correctly formed according to the specification and is passed forward to handlers. Vulnerable code in NFSD is not expecting the oversized request and writes beyond the allocated buffer space. CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H



Severity Score
CVSS Version 2.x 0
CVSS Version 3.x HIGH 7.5


OS name Project name Version Score Severity Status Errata Last updated
CentOS 6 ELS kernel 2.6.32 7.5 HIGH Needs Triage 2022-11-07 23:09:48
CentOS 8.4 ELS kernel 4.18.0-305.25.1 7.5 HIGH Needs Triage 2022-11-07 23:09:51
CentOS 8.5 ELS kernel 4.18.0-348.7.1 7.5 HIGH Needs Triage 2022-11-07 23:09:50
CloudLinux 6 ELS kernel 2.6.32 7.5 HIGH Needs Triage 2022-11-07 23:09:47
Oracle Linux 6 ELS kernel 2.6.32 7.5 HIGH Needs Triage 2022-11-07 23:09:49
Ubuntu 16.04 ELS linux 4.4.0 7.5 HIGH In Testing 2023-01-20 04:03:58
Ubuntu 16.04 ELS linux-hwe 4.15.0 7.5 HIGH Released CLSA-2023:1677764911 2023-03-02 09:38:51
Ubuntu 18.04 ELS linux 4.15.0 7.5 HIGH Needs Triage 2023-03-01 16:06:44