CVE-2022-42328

Host hang via interrupt-disabled SKB free

Published Dec 7, 2022 · Updated Apr 23, 2025

Improper locking in the Linux xen-netback driver allows guest OS users to hang a Xen host through a paravirtualized network interface. In xenvif_start_xmit(), packet-drop handling calls kfree_skb() inside a spin_lock_irqsave-protected section, freeing the socket buffer while interrupts are disabled and allowing a deadlock. Reachability requires a malicious guest using the host's Linux kernel-based xen-netback backend; the deadlock interrupts host service.

CVSS severity6.2
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux xen-netback driver allows guest OS users to hang a Xen host through a paravirtualized network interface. In xenvif_start_xmit(), packet-drop handling calls kfree_skb() inside a spin_lock_irqsave-protected section, freeing the socket buffer while interrupts are disabled and allowing a deadlock. Reachability requires a malicious guest using the host's Linux kernel-based xen-netback backend; the deadlock interrupts host service.

The record

CVE
CVE-2022-42328
Published
Dec 7, 2022
Updated
Apr 23, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-667, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 7, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.2CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499Endpoint Denial of Service

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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