CVE-2022-33743

Guest crash via retained SKB use-after-free

Published Jul 5, 2022 · Updated Aug 3, 2024

Use-after-free in Linux netfront 5.9 through 5.18 allows local users controlling a network backend to crash a Xen guest. In xennet_get_responses(), the misplaced next label skips __skb_queue_tail(), so an SKB retained by xennet_move_rx_slot() can still be freed. The issue adds attacker capability only when a less-than-fully privileged backend, such as a network driver domain, serves the guest; default dom0 netback deployments gain no added capability.

CVSS severity7.8
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux netfront 5.9 through 5.18 allows local users controlling a network backend to crash a Xen guest. In xennet_get_responses(), the misplaced next label skips __skb_queue_tail(), so an SKB retained by xennet_move_rx_slot() can still be freed. The issue adds attacker capability only when a less-than-fully privileged backend, such as a network driver domain, serves the guest; default dom0 netback deployments gain no added capability.

The record

CVE
CVE-2022-33743
Published
Jul 5, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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