CVE-2022-50314Public exploit

Local task hang via interrupted NBD startup

Published Sep 15, 2025 · Updated Sep 15, 2025

Denial of service in the Linux kernel NBD driver allows local users to hang an ioctl task by interrupting device startup with a signal. nbd_start_device_ioctl waits for recv_threads to reach zero but, after a signal, only shuts down the queue and then waits indefinitely for in-flight I/O completion. A local low-privilege user must access an NBD device and issue setup ioctls; the demonstrated result is a hung task rather than data access or code execution.

CVSS severity5.5
Medium
EPSS probability0.16%
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

Denial of service in the Linux kernel NBD driver allows local users to hang an ioctl task by interrupting device startup with a signal. nbd_start_device_ioctl waits for recv_threads to reach zero but, after a signal, only shuts down the queue and then waits indefinitely for in-flight I/O completion. A local low-privilege user must access an NBD device and issue setup ioctls; the demonstrated result is a hung task rather than data access or code execution.

The record

CVE
CVE-2022-50314
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1de7c3cf48fc41cd95adb12bd1ea9033a917798a
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3575949513ea3b387b30dac1e69468a923c86caf
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3ba3846cb3e2fb3c6fbf79e998472821b298419e
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62006a72b05e0d38727eef5188700f2488be5e89
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b2700f98b3f4dd19fb4315b70581e5caff89eb49
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0d73be0af8c1310713bc39a8d7a22e35084e14f
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1de7c3cf48fc41cd95adb12bd1ea9033a917798a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3575949513ea3b387b30dac1e69468a923c86caf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3ba3846cb3e2fb3c6fbf79e998472821b298419e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62006a72b05e0d38727eef5188700f2488be5e89; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b2700f98b3f4dd19fb4315b70581e5caff89eb49; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0d73be0af8c1310713bc39a8d7a22e35084e14f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398

Published CVSS scores

5.5NVDCVSS: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 exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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