CVE-2022-2652Public exploit

Kernel-memory disclosure and crash via card labels

Published Aug 4, 2022 · Updated Aug 3, 2024

Externally controlled format strings in umlaeute v4l2loopback before 0.12.6 allow local users to disclose kernel memory or crash the module. The vidioc_querycap and v4l2_loopback_add paths pass the attacker-controlled card label directly as snprintf's format argument, so percent directives read stack values or exhaust valid arguments. Administrative access is required to supply the module or device label; disclosure is limited to kernel-stack contents, while repeated %s directives can crash the module.

CVSS severity6.0
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Externally controlled format strings in umlaeute v4l2loopback before 0.12.6 allow local users to disclose kernel memory or crash the module. The vidioc_querycap and v4l2_loopback_add paths pass the attacker-controlled card label directly as snprintf's format argument, so percent directives read stack values or exhaust valid arguments. Administrative access is required to supply the module or device label; disclosure is limited to kernel-stack contents, while repeated %s directives can crash the module.

The record

CVE
CVE-2022-2652
Published
Aug 4, 2022
Updated
Aug 3, 2024
Vendor
umlaeute
Product
v4l2loopback
Classifications
CWE-134, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 4, 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?

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

  1. Affected versionversion=unspecified <0.12.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

umlaeute · v4l2loopbackversion=unspecified <0.12.6

Published CVSS scores

6.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
7.3UbuntuCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:L
6.0SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-134Use of Externally-Controlled Format String
T1499.004Application or System Exploitation

Public exploit references

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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