CVE-2022-49295

Kernel service interruption via NBD teardown race

Published Feb 26, 2025 · Updated Aug 5, 2026

Denial of service in the Linux kernel NBD driver allows local users to trigger a kernel oops during concurrent module removal. The nbd_cleanup() path dismantles debugfs and device state before unregistering the Generic Netlink family, allowing an in-flight handler to access torn-down state. Exploitation requires local low-privileged netlink access and a concurrent privileged module unload; the documented consequence is a kernel oops that can interrupt service.

CVSS severity4.7
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel NBD driver allows local users to trigger a kernel oops during concurrent module removal. The nbd_cleanup() path dismantles debugfs and device state before unregistering the Generic Netlink family, allowing an in-flight handler to access torn-down state. Exploitation requires local low-privileged netlink access and a concurrent privileged module unload; the documented consequence is a kernel oops that can interrupt service.

The record

CVE
CVE-2022-49295
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=4.12
  2. Affected versionversion=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c
  3. Affected versionversion=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <06c4da89c24e7023ea448cadf8e9daf06a0aae6e
  4. Affected versionversion=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <1be608e1ee1f222464b2856bda9b85ab5184a33e
  5. Affected versionversion=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <3d5da1ffba3388c2ae2e6c598855a4d887d3bf79
  6. Affected versionversion=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <6f505bbb8063fd3a238a4239d2d8c165e5279f6f
  7. Affected versionversion=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <8a1435c862ea09b06be7acda325128dc08458e25
  8. Affected versionversion=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <c0868f6e728c3c28bef0e8bee89d2daf86a8bbca
  9. Affected versionversion=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <cbeafa7a79d08ecdb55f8f1d41a11323d0f709db

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c; version=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <06c4da89c24e7023ea448cadf8e9daf06a0aae6e; version=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <1be608e1ee1f222464b2856bda9b85ab5184a33e; version=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <3d5da1ffba3388c2ae2e6c598855a4d887d3bf79; version=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <6f505bbb8063fd3a238a4239d2d8c165e5279f6f; version=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <8a1435c862ea09b06be7acda325128dc08458e25; version=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <c0868f6e728c3c28bef0e8bee89d2daf86a8bbca; version=e46c7287b1c27683a8e30ca825fb98e2b97f1099 <cbeafa7a79d08ecdb55f8f1d41a11323d0f709db

Published CVSS scores

4.7CISA ADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7CanonicalCVSS:3.1/AV:L/AC:H/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.

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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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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

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Your stack

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