CVE-2022-50101

Kernel crash via oversized framebuffer clearing

Published Jun 18, 2025 · Updated Aug 5, 2026

Out-of-bounds write in the Linux vt8623 framebuffer driver allows local users to crash the kernel through a framebuffer ioctl. vt8623fb_set_par derives screen_size from user-controlled virtual dimensions and passes it to memset_io without ensuring it does not exceed info->screen_size. Access to /dev/fb* is required; an oversized FBIOPUT_VSCREENINFO request writes beyond the mapped framebuffer and produces a kernel page fault.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the Linux vt8623 framebuffer driver allows local users to crash the kernel through a framebuffer ioctl. vt8623fb_set_par derives screen_size from user-controlled virtual dimensions and passes it to memset_io without ensuring it does not exceed info->screen_size. Access to /dev/fb* is required; an oversized FBIOPUT_VSCREENINFO request writes beyond the mapped framebuffer and produces a kernel page fault.

The record

CVE
CVE-2022-50101
Published
Jun 18, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

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

  1. Affected versionversion=2.6.22
  2. Affected versionversion=558b7bd86c32978648cda5deb5c758d77ef0c165 <4a3cef1eaced13ba9b55381d46bfad937a3dac2c
  3. Affected versionversion=558b7bd86c32978648cda5deb5c758d77ef0c165 <52ad9bfeb8a0e62de30de6d39e8a49a72dd78150
  4. Affected versionversion=558b7bd86c32978648cda5deb5c758d77ef0c165 <73280a184aa2e1a625ce54ce761042955cc79cd0
  5. Affected versionversion=558b7bd86c32978648cda5deb5c758d77ef0c165 <b17caec5127bba6f90af92bcc85871df54548ac0
  6. Affected versionversion=558b7bd86c32978648cda5deb5c758d77ef0c165 <bd8269e57621e5b38cc0b4bd2fa02e85c9f2a441
  7. Affected versionversion=558b7bd86c32978648cda5deb5c758d77ef0c165 <c7a3f41e4b133d4dd25bc996b69039b19a34d69d
  8. Affected versionversion=558b7bd86c32978648cda5deb5c758d77ef0c165 <d71528ccdc7ae8d7500d414091d27805c51407a2
  9. Affected versionversion=558b7bd86c32978648cda5deb5c758d77ef0c165 <ec0754c60217248fa77cc9005d66b2b55200ac06

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.22; version=558b7bd86c32978648cda5deb5c758d77ef0c165 <4a3cef1eaced13ba9b55381d46bfad937a3dac2c; version=558b7bd86c32978648cda5deb5c758d77ef0c165 <52ad9bfeb8a0e62de30de6d39e8a49a72dd78150; version=558b7bd86c32978648cda5deb5c758d77ef0c165 <73280a184aa2e1a625ce54ce761042955cc79cd0; version=558b7bd86c32978648cda5deb5c758d77ef0c165 <b17caec5127bba6f90af92bcc85871df54548ac0; version=558b7bd86c32978648cda5deb5c758d77ef0c165 <bd8269e57621e5b38cc0b4bd2fa02e85c9f2a441; version=558b7bd86c32978648cda5deb5c758d77ef0c165 <c7a3f41e4b133d4dd25bc996b69039b19a34d69d; version=558b7bd86c32978648cda5deb5c758d77ef0c165 <d71528ccdc7ae8d7500d414091d27805c51407a2; version=558b7bd86c32978648cda5deb5c758d77ef0c165 <ec0754c60217248fa77cc9005d66b2b55200ac06

Published CVSS scores

7.8kernel.orgCVSS: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.

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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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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