CVE-2022-49989

Local kernel crash via NULL page unlock

Published Jun 18, 2025 · Updated May 11, 2026

NULL pointer dereference in the Xen privcmd driver in Linux allows local users to crash the kernel through a device-model ioctl. The privcmd_ioctl_dm_op error path passes a potentially NULL pages array to unlock_pages, while lock_pages accepts partial pin_user_pages_fast results without verifying that every requested page was pinned. Low-privileged local access and a Xen-enabled kernel are required; successful triggering interrupts the host by crashing its kernel.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Xen privcmd driver in Linux allows local users to crash the kernel through a device-model ioctl. The privcmd_ioctl_dm_op error path passes a potentially NULL pages array to unlock_pages, while lock_pages accepts partial pin_user_pages_fast results without verifying that every requested page was pinned. Low-privileged local access and a Xen-enabled kernel are required; successful triggering interrupts the host by crashing its kernel.

The record

CVE
CVE-2022-49989
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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

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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=4.11
  2. Affected versionversion=ab520be8cd5d56867fc95cfbc34b90880faf1f9d <45d47bd9b96e7874b98dbcc7602fe2826c5d62a6
  3. Affected versionversion=ab520be8cd5d56867fc95cfbc34b90880faf1f9d <6de50db104af0dc921f593fd95c55db86a52ceef
  4. Affected versionversion=ab520be8cd5d56867fc95cfbc34b90880faf1f9d <c2b7bae7c90051fd6a679d5dee00400d67ebbf4a
  5. Affected versionversion=ab520be8cd5d56867fc95cfbc34b90880faf1f9d <c5deb27895e017a0267de0a20d140ad5fcc55a54

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.11; version=ab520be8cd5d56867fc95cfbc34b90880faf1f9d <45d47bd9b96e7874b98dbcc7602fe2826c5d62a6; version=ab520be8cd5d56867fc95cfbc34b90880faf1f9d <6de50db104af0dc921f593fd95c55db86a52ceef; version=ab520be8cd5d56867fc95cfbc34b90880faf1f9d <c2b7bae7c90051fd6a679d5dee00400d67ebbf4a; version=ab520be8cd5d56867fc95cfbc34b90880faf1f9d <c5deb27895e017a0267de0a20d140ad5fcc55a54

Published CVSS scores

5.5CanonicalCVSS: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.

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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
T1499.004Endpoint Denial of Service: Application 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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