CVE-2020-27418Public exploit

Sensitive-data disclosure via oversized console resize

Published Aug 22, 2023 · Updated Jul 9, 2026

Use-after-free in Fedora Linux kernel 5.9.0-rc9 allows local users with high privileges to read sensitive data via console ioctls. Screen resizing updates vc_size_row, but vgacon_set_origin retains the smaller VGA-memory origin; TIOCLINUX then uses the larger row size to read beyond that region in vgacon_invert_region. Access requires high local privileges and a VGA text console, and the documented impact is limited to kernel-memory disclosure.

CVSS severity4.4
Medium
EPSS probability0.22%
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 Fedora Linux kernel 5.9.0-rc9 allows local users with high privileges to read sensitive data via console ioctls. Screen resizing updates vc_size_row, but vgacon_set_origin retains the smaller VGA-memory origin; TIOCLINUX then uses the larger row size to read beyond that region in vgacon_invert_region. Access requires high local privileges and a VGA text console, and the documented impact is limited to kernel-memory disclosure.

The record

CVE
CVE-2020-27418
Published
Aug 22, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1005
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.9Amazon LinuxCVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
4.4SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.4UbuntuCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1005Data from Local System

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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