CVE-2022-39842

Local system crash via disputed count conversion

Published Sep 5, 2022 · Updated Aug 3, 2024

Disputed integer overflow in the Linux kernel before 5.19 allows local users to crash the system through a large PXA3xx GCU write. The reported pxa3xx_gcu_write mechanism assigns count divided by four to the int variable words, allowing an overflowing conversion to bypass the size check before copy_from_user receives count. The original discoverer states that VFS clamps writes below the overflowing range, making the claimed heap overflow unreachable through the write system call.

CVSS severity6.1
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Disputed integer overflow in the Linux kernel before 5.19 allows local users to crash the system through a large PXA3xx GCU write. The reported pxa3xx_gcu_write mechanism assigns count divided by four to the int variable words, allowing an overflowing conversion to bypass the size check before copy_from_user receives count. The original discoverer states that VFS clamps writes below the overflowing range, making the claimed heap overflow unreachable through the write system call.

The record

CVE
CVE-2022-39842
Published
Sep 5, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
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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