CVE-2022-49316

Client hang via retained NFSv4 layoutget locks

Published Feb 26, 2025 · Updated May 11, 2026

Improper locking in the Linux kernel NFSv4 client allows local users to hang the client through an NFSv4 open operation. The open compound retains layoutget locks while issuing a later RPC such as setattr, whose server recall waits on the held locks and deadlocks. Exploitation requires low-privileged local access and an NFSv4 mount whose server sends a recall; the bounded consequence is availability loss.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper locking in the Linux kernel NFSv4 client allows local users to hang the client through an NFSv4 open operation. The open compound retains layoutget locks while issuing a later RPC such as setattr, whose server recall waits on the held locks and deadlocks. Exploitation requires low-privileged local access and an NFSv4 mount whose server sends a recall; the bounded consequence is availability loss.

The record

CVE
CVE-2022-49316
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.18
  2. Affected versionversion=56f487f8c8fc5d6e582b79a86fc132d050129e15 <08d7a26d115cc7892668baa9750f64bd8baca29b
  3. Affected versionversion=56f487f8c8fc5d6e582b79a86fc132d050129e15 <0ee5b9644f06b4d3cdcd9544f43f63312e425a4c
  4. Affected versionversion=56f487f8c8fc5d6e582b79a86fc132d050129e15 <6949493884fe88500de4af182588e071cf1544ee
  5. Affected versionversion=56f487f8c8fc5d6e582b79a86fc132d050129e15 <6b3fc1496e7227cd6a39a80bbfb7588ef7c7a010
  6. Affected versionversion=56f487f8c8fc5d6e582b79a86fc132d050129e15 <a2b3be930e79cc5d9d829f158e31172b2043f0cd
  7. Affected versionversion=56f487f8c8fc5d6e582b79a86fc132d050129e15 <d4c2a041ed3ba114502d5ed6ace5b1a48d637a8e
  8. Affected versionversion=56f487f8c8fc5d6e582b79a86fc132d050129e15 <ea759ae0a9ae5acee677d722129710ac89cc59c1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.18; version=56f487f8c8fc5d6e582b79a86fc132d050129e15 <08d7a26d115cc7892668baa9750f64bd8baca29b; version=56f487f8c8fc5d6e582b79a86fc132d050129e15 <0ee5b9644f06b4d3cdcd9544f43f63312e425a4c; version=56f487f8c8fc5d6e582b79a86fc132d050129e15 <6949493884fe88500de4af182588e071cf1544ee; version=56f487f8c8fc5d6e582b79a86fc132d050129e15 <6b3fc1496e7227cd6a39a80bbfb7588ef7c7a010; version=56f487f8c8fc5d6e582b79a86fc132d050129e15 <a2b3be930e79cc5d9d829f158e31172b2043f0cd; version=56f487f8c8fc5d6e582b79a86fc132d050129e15 <d4c2a041ed3ba114502d5ed6ace5b1a48d637a8e; version=56f487f8c8fc5d6e582b79a86fc132d050129e15 <ea759ae0a9ae5acee677d722129710ac89cc59c1

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo