---
title: "CVE-2022-33748\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2022-33748?format=md
keywords: index, follow
---

# CVE-2022-33748

Publication date 11 October 2022

Last updated 11 July 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.6 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2022-33748?format=md#impact-score)

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## Description

lock order inversion in transitive grant copy handling As part of XSA-226 a
missing cleanup call was inserted on an error handling path. While doing
so, locking requirements were not paid attention to. As a result two
cooperating guests granting each other transitive grants can cause locks to
be acquired nested within one another, but in respectively opposite order.
With suitable timing between the involved grant copy operations this may
result in the locking up of a CPU.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2022-33748?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| xen | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 25.04 plucky | Ignored end of life, was needs-triage |
| 24.10 oracular | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 23.10 mantic | Ignored end of life, was needs-triage |
| 23.04 lunar | Ignored end of life, was needs-triage |
| 22.10 kinetic | Ignored end of life, was needs-triage |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |
| 14.04 LTS trusty | Ignored end of standard support |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

hypervisor packages are in universe. For
issues in the hypervisor, add appropriate
tags to each section, ex:
Tags\_xen: universe-binary

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.6 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Local |
  | Attack complexity | High |
  | Privileges required | Low |
  | User interaction | None |
  | Scope | Changed |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.6 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-33748)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2022-33748)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2022-33748)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2022-33748)

### Other references

* <https://xenbits.xen.org/xsa/advisory-411.html>
* <https://xenbits.xenproject.org/xsa/advisory-411.txt>
* <http://xenbits.xen.org/xsa/advisory-411.html>
* <http://www.openwall.com/lists/oss-security/2022/10/11/2>
* <https://www.cve.org/CVERecord?id=CVE-2022-33748>