CVE-2023-31084Public exploit

Kernel deadlock via DVB event lock misuse

Published Apr 24, 2023 · Updated Mar 18, 2025

Deadlock in the Linux kernel 6.2 DVB Core driver allows local users to hang the kernel through a crafted FE_GET_EVENT ioctl sequence. In dvb_frontend_get_event, wait_event_interruptible evaluates dvb_frontend_test_event, which calls down on fepriv->sem while the task is not running. Access to the DVB frontend device and permission to issue FE_GET_EVENT are required; triggering the lock sequence can deadlock the kernel and halt the host.

CVSS severity5.5
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the Linux kernel 6.2 DVB Core driver allows local users to hang the kernel through a crafted FE_GET_EVENT ioctl sequence. In dvb_frontend_get_event, wait_event_interruptible evaluates dvb_frontend_test_event, which calls down on fepriv->sem while the task is not running. Access to the DVB frontend device and permission to issue FE_GET_EVENT are required; triggering the lock sequence can deadlock the kernel and halt the host.

The record

CVE
CVE-2023-31084
Published
Apr 24, 2023
Updated
Mar 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-833, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS: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 exploitPublished

Weakness, pattern, technique

CWE-833Deadlock
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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